Long-chain composition, long-chain composition kit, manufacturing method and application thereof
阅读说明：本技术 一种长链组合物、长链组合物套组、其制造方法及其应用 (Long-chain composition, long-chain composition kit, manufacturing method and application thereof ) 是由 张霖 樊亚超 师文静 于 2020-10-26 设计创作，主要内容包括：本发明涉及一种长链组合物或长链组合物套组、其制造方法、及其在通过发酵法制造长链二元酸中的应用。所述长链组合物包含选自C9-18直链或支链烷烃中的至少一种长链烷烃和选自C9-18直链或支链、饱和或不饱和的脂肪族一元羧酸中的至少一种长链羧酸,其中所述长链烷烃与所述长链羧酸的质量比为1:1至40:1。所述长链组合物在作为原料通过发酵法来制造长链二元酸时,表现出发酵水平较高或底物利用率较高等优点。(The present invention relates to a long-chain composition or a long-chain composition kit, a method for producing the same, and use thereof for producing a long-chain dibasic acid by a fermentation method. The long-chain composition comprises at least one long-chain alkane selected from C9-18 straight-chain or branched-chain alkanes and at least one long-chain carboxylic acid selected from C9-18 straight-chain or branched-chain, saturated or unsaturated aliphatic monocarboxylic acids, wherein the mass ratio of the long-chain alkane to the long-chain carboxylic acid is 1:1 to 40: 1. The long-chain composition has the advantages of higher fermentation level or higher substrate utilization rate and the like when used as a raw material to prepare the long-chain dibasic acid by a fermentation method.)
1. A long-chain composition (preferably for fermentation) comprising at least one long-chain alkane selected from C9-18 linear or branched (preferably linear) alkanes (preferably at least one long-chain alkane selected from n-dodecane, n-tetradecane and n-hexadecane, especially n-dodecane) and at least one long-chain carboxylic acid selected from C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic monocarboxylic acids (preferably at least one long-chain carboxylic acid selected from lauric acid, myristic acid and palmitic acid, especially lauric acid), wherein the mass ratio of the long-chain alkane to the long-chain carboxylic acid is from 1:1 to 40:1 (preferably from 2:1 to 20:1 or from 5:1 to 10: 1).
2. The long-chain composition of claim 1, further comprising water, wherein the mass of the water is 0.5 to 10 times (preferably 1 to 5 times or 1 to 3 times) the sum of the masses of the long-chain alkane and the long-chain carboxylic acid.
3. The long-chain composition of claim 1, having a pH of 5 to 12 (preferably 7 to 10, 7.5 to 9 or 7.5 to 8.0) and/or being in the form of a liquid or a mixture of solid and liquid at 32 ℃ (preferably in the form of a liquid, in particular an aqueous liquid), and/or the long-chain alkane and the long-chain carboxylic acid having the same number of carbon atoms.
4. A kit of long-chain compositions comprising n long-chain compositions according to any one of claims 1 to 3, wherein n is a positive integer from 2 to 40 (preferably 4 to 20 or 5 to 10), independently present (e.g. packaged or separated from each other), wherein in the ith (i is any positive integer from 2 to n) long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RiIn the 1 st long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is R1In the nth long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RnThen R isi-1/RiNot less than 1 (preferably R)i-1/Ri=1-20、Ri-1/Ri=1.0001-10、Ri-1/Ri=1.001-10、Ri-1/Ri=1.01-10、Ri-1/Ri=1.1-5 or Ri-1/Ri= 1.5-2) and R1/Rn> 1 (preferably R)1/Rn=1.0001-30、R1/Rn=1.001-20、R1/Rn=1.01-10、R1/Rn=1.1-5 or R1/Rn=1.5-2）。
5. The set of long-chain compositions of claim 4, wherein the n long-chain compositions are separately manufactured, and/or the weight ratio of any two of the n long-chain compositions to each other (calculated as the amount of the long-chain compositions) is the same or different (preferably the same or substantially the same), and/or the weight ratio of any two of the n long-chain compositions to each other (calculated as the amount of the long-chain alkanes) is the same or substantially the same.
6. A process for the manufacture of a long-chain composition, preferably for fermentation, wherein the long-chain composition comprises at least one long-chain alkane selected from C9-18 linear or branched (preferably linear) alkanes (preferably at least one long-chain alkane selected from n-dodecane, n-tetradecane and n-hexadecane, in particular n-dodecane) and at least one long-chain carboxylic acid selected from C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic monocarboxylic acids (preferably at least one long-chain carboxylic acid selected from lauric acid, myristic acid and palmitic acid, in particular lauric acid), wherein the mass ratio of the long-chain alkane to the long-chain carboxylic acid is from 1:1 to 40:1 (preferably from 2:1 to 20:1 or from 5:1 to 10: 1), the process at least comprising a mixing step: mixing (preferably until mixing is uniform) the long-chain alkane and the long-chain carboxylic acid at the mass ratio optionally under heating (preferably at a heating temperature of 45 to 70 ℃ or 50 to 60 ℃) and stirring (preferably at a stirring speed of 50 to 250rpm or 150 to 250 rpm) to obtain the long-chain composition.
7. The manufacturing process according to claim 6, wherein water and a pH regulator (such as a base, in particular at least one selected from sodium hydroxide and potassium hydroxide) are further added in the mixing step, and/or the manufacturing process further comprises a step of adding water and a pH regulator (such as a base, in particular at least one selected from sodium hydroxide and potassium hydroxide) to the long-chain composition, optionally under heating (preferably at a heating temperature of 45 to 70 ℃ or 50 to 60 ℃) and stirring (preferably at a stirring speed of 50 to 250rpm or 150 to 250 rpm), wherein the mass of the water is 0.5 to 10 times (preferably 1 to 5 times or 1 to 3 times) the sum of the masses of the long-chain alkane and the long-chain carboxylic acid, and the pH regulator is used in such an amount that the pH of the long-chain composition reaches 5 to 12 (preferably 7 to 10 times, preferably 7 to 12, 7.5-9 or 7.5-8.0).
8. A process for producing a long-chain dibasic acid, wherein the long-chain dibasic acid is at least one long-chain dibasic acid selected from the group consisting of C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic dibasic acids (preferably at least one long-chain dibasic acid selected from the group consisting of dodecanedioic acid, tetradecanedioic acid and hexadecanedioic acid, particularly dodecanedioic acid),
the manufacturing method comprises the following steps:
(1) producing a macromers composition according to the method of manufacture of claim 6, providing a macromers composition of claim 1, or providing a kit of macromers composition of claim 4, collectively referred to as macromers compositions;
(2) and (3) performing a fermentation reaction on the long-chain composition in the presence of zymophyte and a fermentation medium to convert the long-chain composition into the long-chain dibasic acid.
9. The production process according to claim 8, wherein the fermentation medium is a yeast having an intact α, ω -oxidation pathway (preferably at least one yeast selected from the group consisting of Candida, Cryptococcus, Endomyces, Hansenula, Pichia, Rhodotorula, Torulopsis, and Trichosporon, more preferably at least one yeast selected from the group consisting of Candida, particularly Candida tropicalis, more particularly Candida tropicalis mutant strain PF-UV-56 (deposited by China general microbiological culture Collection center with accession number CGMCC No. 0356)), and/or the fermentation medium comprises: 20 to 28g/L of sucrose, 0.8 to 1.5g/L of corn steep liquor, 2.0 to 4.0g/L of yeast extract, 0.8 to 1.2g/L of sodium chloride, 3.0 to 3.5g/L of monopotassium phosphate, 1.2 to 1.8g/L of magnesium sulfate, 1.2 to 4.8g/L of urea, 1.5 to 2g/L of ammonium sulfate and 1.5 to 1.8g/L of sodium acetate.
10. The manufacturing process of claim 8, wherein the fermentation reaction comprises the steps of:
the preparation method comprises the following steps: mixing the fermentation tubes and the fermentation medium, performing the fermentation reaction for 5-60 hours (preferably 10-40 hours, more preferably 20-30 hours or 24 hours) to obtain a fermentation base solution,
a conversion step: adding the long-chain composition to the fermentation base liquid, and performing the fermentation reaction for 60-400 hours (preferably 100-300 hours, more preferably 100-160 hours or 100-140 hours) to convert the long-chain composition into the long-chain dibasic acid.
11. The manufacturing method according to claim 8, wherein the addition amount (by volume) of the fermentation broth seed liquid is 2-30% (preferably 5-20% or 10-15%) of the total liquid control volume, and/or the reaction temperature of the fermentation reaction is 25-37 ℃, preferably 28-32 ℃, and/or the stirring rotation speed of the fermentation reaction is 100-1000 rpm (preferably 120-500rpm or 150-300 rpm), and/or the aeration amount of the fermentation reaction is 0.2-10.0 VVM (preferably 0.2-2.0 VVM or 0.5-1.0 VVM), and/or the reaction time of the fermentation reaction is more than 65 hours (preferably more than 120 hours, more preferably 130-400 hours, 130-300 hours, 130-200 hours, or 138-160 hours), and/or the addition amount of the long-chain composition is 100-1000 g/L of the total liquid control volume (preferably 100-500 g/L of the total liquid control volume or 150-250 g/L of the total liquid control volume) Volume), and/or the fermentation medium is added in an amount of 12 to 80g/L total liquid hold volume (preferably 32 to 50g/L total liquid hold volume, 35 to 45g/L total liquid hold volume, or 37 to 42g/L total liquid hold volume).
12. The manufacturing process according to claim 10, wherein in the preliminary step (preferably within 24 hours from the start of the preliminary step), the long-chain composition is not added and the pH of the fermentation reaction is in a autogenous state (i.e. pH control is not performed), and/or, at the start of the conversion step (preferably 24 hours after the start of the preliminary step), the pH of the fermentation reaction is adjusted to between 6.0 and 7.5 (preferably between 6.8 and 7.0), followed by an increase of the pH of the fermentation reaction of 0.05 to 0.4 (preferably 0.1 to 0.3) every 5-60 hours (preferably every 10-40 hours or every 20-30 hours or every 24 hours) until the end of the fermentation reaction.
13. The production process according to claim 10, wherein in the converting step, the long-chain composition is added in n batches, and the time interval between adjacent two batches may be the same or different (preferably, the time interval is 5 to 60 hours, 10 to 40 hours, 20 to 30 hours, or 24 hours), wherein n is a positive integer of 2 to 40 (preferably, 4 to 20 or 5 to 10), or the long-chain composition is continuously added according to the reaction time.
14. The manufacturing process of claim 13, wherein the n long-chain compositions are added separately in the n batches (preferably in order from the 1 st long-chain composition to the nth long-chain composition) using the long-chain composition set of claim 4, or continuously according to a function R = f (t), wherein R is the mass ratio of the long-chain alkane to the long-chain carboxylic acid, t is the reaction time of the conversion step, and f () represents any non-increasing function (preferably any decreasing function, any monotonically decreasing function, or any linearly decreasing function).
15. The production method according to claim 8, further comprising a step of separating the long-chain dibasic acid from a reaction product of the fermentation reaction.
Technical Field
The invention belongs to the technical field of biochemical engineering, and particularly relates to a long-chain composition or a long-chain composition kit. The invention also relates to a method for manufacturing the long-chain composition or the long-chain composition set and application thereof in manufacturing the long-chain dibasic acid.
Background
Dodecanedioic acid (DDDA for short) is aliphatic dicarboxylic acid with 12 carbon atoms in a carbon chain, is a fine chemical product with important and wide industrial application, and is also an important raw material for synthesizing high-grade spices, high-performance nylon engineering plastics, high-grade nylon hot melt adhesives, high-temperature dielectrics, high-grade paints and coatings, high-grade lubricating oil, cold-resistant plasticizers, resins, medicines, pesticides and the like in the chemical industry.
The fermentation process of producing long chain binary acid is to oxidize the methyl at two ends of long chain n-alkane into carboxyl separately through alpha and omega oxidation at normal temperature and pressure to produce various long chain binary acids in corresponding chain length. There are many kinds of bacteria, molds and actinomycetes capable of producing long-chain dibasic acids by fermentation, among which yeast of the genus Candida (Candida) is a high-yield microorganism for producing dibasic acids by n-alkane fermentation.
In the prior art, yeast is generally used as a fermentation strain, normal alkane is used as a substrate, and long-chain dibasic acid with corresponding carbon number is produced, such as CN102115767A, CN102115768A and the like, so that manufacturing schemes of undecanedioic acid and hexadecanedioic acid are respectively formed. In addition, CN103805643A discloses a method for producing long-chain dicarboxylic acid, which is to perform extensive culture on a dicarboxylic acid strain to obtain a seed solution, perform extensive fermentation on the seed solution, add emulsified alkane during the fermentation process, remove mycoprotein after the reaction is finished, and crystallize to obtain a long-chain dicarboxylic acid product.
Disclosure of Invention
The inventor of the present invention found that the prior art still has the problems of low fermentation level or low substrate utilization rate, etc. when the long-chain dibasic acid is produced by using the normal alkane as the substrate. The present invention has been completed based on this finding.
Specifically, the present invention relates to the following aspects.
1. A long-chain composition (preferably for fermentation) comprising at least one long-chain alkane selected from C9-18 linear or branched (preferably linear) alkanes (preferably at least one long-chain alkane selected from n-dodecane, n-tetradecane and n-hexadecane, especially n-dodecane) and at least one long-chain carboxylic acid selected from C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic monocarboxylic acids (preferably at least one long-chain carboxylic acid selected from lauric acid, myristic acid and palmitic acid, especially lauric acid), wherein the mass ratio of the long-chain alkane to the long-chain carboxylic acid is from 1:1 to 40:1 (preferably from 2:1 to 20:1 or from 5:1 to 10: 1).
2. The long-chain composition according to any of the preceding or subsequent aspects, further comprising water, wherein the mass of the water is 0.5 to 10 times (preferably 1 to 5 times or 1 to 3 times) the sum of the masses of the long-chain alkane and the long-chain carboxylic acid.
3. The long-chain composition according to any of the preceding or subsequent aspects, which has a pH of from 5 to 12 (preferably from 7 to 10, from 7.5 to 9 or from 7.5 to 8.0), and/or which is in the form of a liquid or a mixture of solid and liquid (preferably in the form of a liquid, especially an aqueous liquid) at 32 ℃, and/or the long-chain alkane and the long-chain carboxylic acid have the same number of carbon atoms.
4. A set of long-chain compositions comprising n long-chain compositions according to any of the preceding or subsequent aspects independently present (e.g. packaged or separated from each other) wherein n is a positive integer from 2 to 40 (preferably 4 to 20 or 5 to 10), wherein in the ith (i being any positive integer from 2 to n) long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RiIn the 1 st long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is R1In the nth long-chain composition,the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RnThen R isi-1/RiNot less than 1 (preferably R)i-1/Ri=1-20、Ri-1/Ri=1.0001-10、Ri-1/Ri=1.001-10、Ri-1/Ri=1.01-10、Ri-1/Ri=1.1-5 or Ri-1/Ri= 1.5-2) and R1/Rn> 1 (preferably R)1/Rn=1.0001-30、R1/Rn=1.001-20、R1/Rn=1.01-10、R1/Rn=1.1-5 or R1/Rn=1.5-2）。
5. The set of long-chain compositions according to any of the preceding or subsequent aspects, wherein the n long-chain compositions are individually manufactured, and/or the weight ratio (calculated as the amount of the long-chain composition) of any two of the n long-chain compositions to each other is the same or different (preferably the same or substantially the same), and/or the weight ratio (calculated as the amount of the long-chain alkane) of any two of the n long-chain compositions to each other is the same or substantially the same.
6. A process for the manufacture of a long-chain composition, preferably for fermentation, wherein the long-chain composition comprises at least one long-chain alkane selected from C9-18 linear or branched (preferably linear) alkanes (preferably at least one long-chain alkane selected from n-dodecane, n-tetradecane and n-hexadecane, in particular n-dodecane) and at least one long-chain carboxylic acid selected from C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic monocarboxylic acids (preferably at least one long-chain carboxylic acid selected from lauric acid, myristic acid and palmitic acid, in particular lauric acid), wherein the mass ratio of the long-chain alkane to the long-chain carboxylic acid is from 1:1 to 40:1 (preferably from 2:1 to 20:1 or from 5:1 to 10: 1), the process at least comprising a mixing step: mixing (preferably until mixing is uniform) the long-chain alkane and the long-chain carboxylic acid at the mass ratio optionally under heating (preferably at a heating temperature of 45 to 70 ℃ or 50 to 60 ℃) and stirring (preferably at a stirring speed of 50 to 250rpm or 150 to 250 rpm) to obtain the long-chain composition.
7. The production method according to any one of the preceding or subsequent aspects, wherein water and a pH adjuster (such as a base, particularly at least one selected from sodium hydroxide and potassium hydroxide) are further added in the mixing step, and/or the production method further comprises a step of adding water and a pH adjuster (such as a base, particularly at least one selected from sodium hydroxide and potassium hydroxide) to the long-chain composition, optionally under heating (preferably at a heating temperature of 45 to 70 ℃ or 50 to 60 ℃) and stirring (preferably at a stirring speed of 50 to 250rpm or 150 to 250 rpm), wherein the mass of the water is 0.5 to 10 times (preferably 1 to 5 times or 1 to 3 times) the sum of the masses of the long-chain alkane and the long-chain carboxylic acid, and the pH adjuster is used in such an amount that the pH of the composition reaches 5 to 12 (preferably 7 to 10 times ), 7.5-9 or 7.5-8.0).
8. A process for producing a long-chain dibasic acid, wherein the long-chain dibasic acid is at least one long-chain dibasic acid selected from the group consisting of C9-18 linear or branched (preferably linear), saturated or unsaturated (preferably saturated) aliphatic dibasic acids (preferably at least one long-chain dibasic acid selected from the group consisting of dodecanedioic acid, tetradecanedioic acid and hexadecanedioic acid, particularly dodecanedioic acid),
the manufacturing method comprises the following steps:
(1) producing a long-chain composition according to the production method according to any of the preceding or following aspects, providing a long-chain composition according to any of the preceding or following aspects, or providing a long-chain composition kit according to any of the preceding or following aspects, collectively referred to as long-chain compositions;
(2) and (3) performing a fermentation reaction on the long-chain composition in the presence of zymophyte and a fermentation medium to convert the long-chain composition into the long-chain dibasic acid.
9. The production process according to any one of the preceding or subsequent aspects, wherein the fermentation tubes are yeasts having an intact alpha, omega-oxidation pathway (preferably selected from the group consisting of Candida, Cryptococcus, Endomyces, Hansenula, Pichia, Rhodotorula, Torulopsis and TrichosporonMore preferably at least one yeast selected from the genus candida, in particular candida tropicalis, more particularly candida tropicalis (c)Candida tropicalis) The mutant strain PF-uv-56 (preserved in China general microbiological culture Collection center with the preservation number of CGMCC No. 0356)) and/or the fermentation medium comprises: 20 to 28g/L of sucrose, 0.8 to 1.5g/L of corn steep liquor, 2.0 to 4.0g/L of yeast extract, 0.8 to 1.2g/L of sodium chloride, 3.0 to 3.5g/L of monopotassium phosphate, 1.2 to 1.8g/L of magnesium sulfate, 1.2 to 4.8g/L of urea, 1.5 to 2g/L of ammonium sulfate and 1.5 to 1.8g/L of sodium acetate.
10. The manufacturing method according to any one of the preceding or subsequent aspects, wherein the fermentation reaction comprises the steps of:
the preparation method comprises the following steps: mixing the fermentation tubes and the fermentation medium, performing the fermentation reaction for 5-60 hours (preferably 10-40 hours, more preferably 20-30 hours or 24 hours) to obtain a fermentation base solution,
a conversion step: adding the long-chain composition to the fermentation base liquid, and performing the fermentation reaction for 60-400 hours (preferably 100-300 hours, more preferably 100-160 hours or 100-140 hours) to convert the long-chain composition into the long-chain dibasic acid.
11. The method according to any one of the preceding or subsequent aspects, wherein the fermentation broth seed solution is added in an amount (by volume) of 2-30% (preferably 5 to 20% or 10 to 15%) of the total broth control volume, and/or the fermentation reaction has a reaction temperature of 25 to 37 ℃, preferably 28 to 32 ℃, and/or the fermentation reaction has an agitation speed of 100 to 1000rpm (preferably 120 to 500rpm or 150 to 300 rpm), and/or the fermentation reaction has an aeration rate of 0.2 to 10.0VVM (preferably 0.2 to 2.0VVM or 0.5 to 1.0 VVM), and/or the fermentation reaction has a reaction time of 65 hours or more (preferably greater than 120 hours, more preferably 130 to 400 hours, 130 to 300 hours, 130 to 200 hours, or 138 to 160 hours), and/or the long-chain composition is added in an amount of 100 to 1000g/L of the total broth control volume (preferably 100 to 500g/L of the total broth control volume or 150 to 250g/L of the long-chain composition L total liquid hold volume), and/or the fermentation medium is added in an amount of 12 to 80g/L total liquid hold volume (preferably 32 to 50g/L total liquid hold volume, 35 to 45g/L total liquid hold volume, or 37 to 42g/L total liquid hold volume).
12. The production process according to any one of the preceding or subsequent aspects, wherein in the preliminary step (preferably within 24 hours from the start of the preliminary step), the long-chain composition is not added and the pH of the fermentation reaction is in an autogenous state (i.e., pH control is not performed), and/or, at the start of the conversion step (preferably 24 hours after the start of the preliminary step), the pH of the fermentation reaction is adjusted to between 6.0 and 7.5 (preferably between 6.8 and 7.0), and then the pH of the fermentation reaction is increased by 0.05 to 0.4 (preferably 0.1 to 0.3) every 5 to 60 hours (preferably every 10 to 40 hours or every 20 to 30 hours or every 24 hours) until the end of the fermentation reaction.
13. The production process according to any one of the preceding or subsequent aspects, wherein in the conversion step, the long-chain composition is added in n batches, and the time interval between adjacent two batches may be the same or different (preferably, the time interval is 5 to 60 hours, 10 to 40 hours, 20 to 30 hours, or 24 hours), wherein n is a positive integer of 2 to 40 (preferably, 4 to 20 or 5 to 10), or the long-chain composition is continuously added according to the reaction time.
14. The manufacturing method according to any one of the preceding or subsequent aspects, wherein the n long-chain compositions are added separately in the n batches (preferably in order from the 1 st long-chain composition to the nth long-chain composition) using the long-chain composition set according to any one of the preceding or subsequent aspects, or the long-chain compositions are added continuously according to a function R = f (t), wherein R is the mass ratio of the long-chain alkane to the long-chain carboxylic acid, t is the reaction time of the conversion step, and f () represents any non-increasing function (preferably any decreasing function, any monotonically decreasing function, or any linearly decreasing function).
15. The production method according to any one of the preceding or subsequent aspects, further comprising a step of separating the long-chain dibasic acid from a reaction product of the fermentation reaction.
The present invention also relates to the following aspects.
1. A method for preparing dodecanedioic acid, characterized by comprising the steps of:
(1) mixing dodecane and lauric acid in proportion, heating and stirring to fully dissolve the lauric acid, then adding water into the mixture, uniformly mixing, adding alkali to adjust the pH value to 7-9, and obtaining a mixed substrate;
(2) adding zymophyte and fermentation medium into a fermentation tank for fermentation, and supplementing the mixed substrate prepared in the step (1) in the fermentation process until the fermentation is finished;
(3) after the fermentation is finished, the long-chain dicarboxylic acid product is obtained after demulsification, membrane filtration, acidification, filtration and drying treatment.
2. The method according to any of the preceding or subsequent aspects, characterized in that: the mass ratio of the dodecane to the lauric acid in the step (1) is 2:1-10:1, preferably 5:1-10: 1.
3. The method according to any of the preceding or subsequent aspects, characterized in that: heating the temperature in the step (1) to 45-70 ℃, preferably 50-60 ℃; the stirring speed is 50-250rpm, preferably 150-250 rpm.
4. The method according to any of the preceding or subsequent aspects, characterized in that: adding water with the mass 1-3 times of that of the mixture into the step (1).
5. The method according to any of the preceding or subsequent aspects, characterized in that: adding alkali to adjust the pH value to 7-9, preferably 7.5-8.0 after uniformly mixing in the step (1); the alkali is at least one of sodium hydroxide and potassium hydroxide.
6. The method according to any of the preceding or subsequent aspects, characterized in that: the twelve-carbon fermentation bacteria in the step (2) are yeasts with complete alpha and omega-oxidation pathways, and preferably at least one of candida, cryptococcus, endospore mold, hansenula, pichia, rhodotorula, torulopsis or trichosporon.
7. The method according to any of the preceding or subsequent aspects, characterized in that: the formula of the fermentation medium in the step (2) is as follows: 20-28g/L of sucrose, 0.8-1.5g/L of corn steep liquor, 2.0-4.0g/L of yeast extract, 0.8-1.2g/L of sodium chloride, 3.0-3.5g/L of potassium dihydrogen phosphate, 1.2-1.8g/L of magnesium sulfate, 1.2-4.8g/L of urea, 1.5-2g/L of ammonium sulfate and 1.5-1.8g/L of sodium acetate.
8. The method according to any of the preceding or subsequent aspects, characterized in that: the addition amount of the zymophyte seed liquid in the step (2) is 5-20 percent of the volume of the fermentation liquid, preferably 10-15 percent.
9. The method according to any of the preceding or subsequent aspects, characterized in that: the fermentation temperature of the step (2) is 25-37 ℃, and preferably 28-32 ℃; the stirring speed is 120-500rpm, preferably 150-300 rpm; the ventilation amount is 0.2-1.0VVM, preferably 0.5-1.0 VVM; the fermentation time was 138-144 hours.
10. The method according to any of the preceding or subsequent aspects, characterized in that: the pH control mode in the step (2) is specifically as follows: within 0-24h of fermentation, pH control is not carried out; after 24 hours, adjusting the pH value to be in a neutral range of 6.8-7.0; the pH control was then increased by 0.1-0.3 every 24h until the reaction was complete.
11. The method according to any of the preceding or subsequent aspects, characterized in that: and (3) supplementing the mixed substrate in the step (1) in a batch feeding or fed-batch feeding manner in the fermentation process in the step (2).
12. The method according to any of the preceding or subsequent aspects, characterized in that: feeding in batches, namely feeding in 5-10 batches; feeding materials are fed and the feeding speed is calculated according to the fermentation time.
13. The method according to any of the preceding or subsequent aspects, characterized in that: the demulsification in the step (3) is to adjust the pH of the fermentation liquor to 8.5-10, preferably 9-9.5, heat the fermentation liquor to 75-90 ℃ and maintain the fermentation liquor for 20-40 min.
14. The method according to any of the preceding or subsequent aspects, characterized in that: the membrane filtration in the step (3) is to filter the emulsion breaking liquid through a membrane and carry out solid-liquid separation to obtain a filtered clear liquid; the filtration temperature is 30-50 deg.C, preferably 40-50 deg.C, and the membrane pore diameter is 10-50nm, preferably 20-25 nm.
15. The method according to any of the preceding or subsequent aspects, characterized in that: and (3) the acid precipitation is to perform acid pH adjustment on the filtered clear solution, control the pH to be 3-5, preferably 3-4, and precipitate the long-chain dicarboxylic acid.
16. The method according to any of the preceding or subsequent aspects, characterized in that: filtering by adopting a plate frame in the filtering operation in the step (3), wherein the filtering pressure is 0.5-1.0MPa, and the filtering temperature is 20-30 ℃; the drying temperature is 80-105 ℃, and the drying time is 5-20 h.
Technical effects
Compared with the prior art, the invention can achieve at least one of the following technical effects, and preferably all of the following technical effects.
(1) According to the long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid meets the specification of the invention, so that the fermentation level can be improved when the long-chain composition is used in a fermentation process, and the problems that the long-chain carboxylic acid is poor in water solubility and is difficult to use in a fermentation system can be solved.
(2) According to the long-chain composition, in a preferable case, two steps of physical dissolution and chemical dissociation are adopted, so that the dissolution effect of the long-chain carboxylic acid is increased, the long-chain alkane and the long-chain carboxylic acid are promoted to form polar soluble micelles, and the fermentation level is further improved.
(3) According to the preparation method of the long-chain composition, under the optimal condition, an alkaline regulation scheme is adopted, the problem of pH fluctuation in the fermentation process caused by material supplement is reduced, and the material supplement in a fed-batch mode is further adopted, so that the substrate utilization rate is improved, and the fermentation level is improved.
(4) According to the fermentation method, the long-chain carboxylic acid can be used as a carbon source, and part of the long-chain carboxylic acid can be directly metabolized through fatty acid to obtain an important intermediate metabolite, namely acetyl coenzyme A, so that the biomass can be rapidly accumulated, the fermentation time can be shortened, and the production intensity of the long-chain dicarboxylic acid can be improved.
(5) According to the fermentation method of the present invention, the fermentation level and the production intensity of the long-chain dicarboxylic acid can be further improved by increasing the subsequent addition amount of the long-chain fatty acid during the fermentation, in a preferable case.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims.
All publications, patent applications, patents, and other references mentioned in this specification are herein incorporated by reference in their entirety. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In case of conflict, the present specification, including definitions, will control.
When the specification concludes with claims with the heading "known to those skilled in the art", "prior art", or the like, to derive materials, substances, methods, procedures, devices, or components, etc., it is intended that the subject matter derived from the heading encompass those conventionally used in the art at the time of filing this application, but also include those that are not currently in use, but would become known in the art to be suitable for a similar purpose.
In the context of this specification, the word "substantially" means that a deviation within ± 10%, within ± 5%, within ± 1%, within ± 0.5% or within ± 0.1% is allowed, which is acceptable or considered reasonable by a person skilled in the art.
In the context of the present specification, the term "total liquid control volume" means the total volume of the liquid phase of the fermenter, typically 70% to 80% of the volume of the fermenter.
All percentages, parts, ratios, etc. referred to in this specification are by weight and pressures are gauge pressures unless otherwise specifically indicated.
In the context of this specification, any two or more embodiments of the invention may be combined in any combination, and the resulting solution is part of the original disclosure of this specification, and is within the scope of the invention.
According to one embodiment of the invention, a long chain composition is provided. The long-chain composition is preferably a long-chain composition for fermentation, and is particularly suitable for use in the production of a long-chain dibasic acid by a fermentation method as a raw material.
According to one embodiment of the invention, the long-chain composition comprises at least one long-chain alkane selected from C9-18 linear or branched alkanes and at least one long-chain carboxylic acid selected from C9-18 linear or branched, saturated or unsaturated aliphatic monocarboxylic acids. Here, as the long-chain alkane, at least one long-chain alkane selected from C9-18 linear alkanes is preferable, and at least one long-chain alkane selected from n-dodecane, n-tetradecane and n-hexadecane is more preferable, and n-dodecane is particularly preferable. The long-chain carboxylic acid is preferably at least one long-chain carboxylic acid selected from C9-18 linear and saturated aliphatic monocarboxylic acids, particularly preferably at least one long-chain carboxylic acid selected from lauric acid, myristic acid, and palmitic acid, and particularly lauric acid.
According to one embodiment of the invention, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is generally from 1:1 to 40:1, preferably from 2:1 to 20:1 or from 5:1 to 10: 1.
According to one embodiment of the invention, the long-chain composition further comprises water. Here, the mass of the water is generally 0.5 to 10 times, preferably 1 to 5 times or 1 to 3 times the sum of the masses of the long-chain alkane and the long-chain carboxylic acid.
According to one embodiment of the invention, the pH of the long-chain composition is generally 5 to 12, preferably 7 to 10, 7.5 to 9 or 7.5 to 8.0. In the context of the present specification, the method for measuring the pH of the long-chain composition may employ a pH paper method or a glass electrode method.
According to one embodiment of the invention, the long-chain composition is in the form of a liquid or a mixture of solid and liquid at 32 ℃, preferably in the form of a liquid, in particular an aqueous liquid. In the context of the present specification, a liquid comprises both homogeneous and heterogeneous liquids, the latter being, for example, a multiphase liquid-like mixture of two or more liquids.
According to one embodiment of the invention, in the long-chain composition, the long-chain alkane and the long-chain carboxylic acid have the same number of carbon atoms, such as a combination of n-dodecane and lauric acid.
According to an embodiment of the present invention, the invention further relates to a long-chain composition kit, which comprises a plurality of long-chain compositions according to any one of the embodiments of the present specification. In particular, the set of long-chain compositions comprises n long-chain compositions according to any one of the embodiments of the present specification independently. Here, n is generally a positive integer from 2 to 40, preferably from 4 to 20 or from 5 to 10. In addition, the term "independent of each other" means that the packages are packed independently of each other or are separated independently of each other, that is, a plurality of compartments in the same package.
According to this embodiment of the present invention, in the i-th long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RiIn the 1 st long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is R1In the nth long-chain composition, the mass ratio of the long-chain alkane to the long-chain carboxylic acid is RnThen, in general, Ri-1/RiNot less than 1, preferably Ri-1/Ri=1-20、Ri-1/Ri=1.0001-10、Ri-1/Ri=1.001-10、Ri-1/Ri=1.01-10、Ri-1/Ri=1.1-5 or Ri-1/RiAnd (5) = 1.5-2. Here, i is any positive integer from 2 to n.
According to this embodiment of the invention, preferably, R1/Rn> 1, preferably R1/Rn=1.0001-30、R1/Rn=1.001-20、R1/Rn=1.01-10、R1/Rn=1.1-5 or R1/Rn=1.5-2。
According to one embodiment of the present invention, in the set of long-chain compositions, the n long-chain compositions are individually manufactured. The methods for producing these long-chain compositions can be described below with reference to the present specification.
According to one embodiment of the invention, the weight ratio of any two of the n long-chain compositions to each other (calculated as the amount of the long-chain compositions) in the set of long-chain compositions is the same or different, preferably the same or substantially the same.
According to another embodiment of the invention, the weight ratio (calculated as the amount of long chain alkane) of any two of the n long chain compositions to each other in the set of long chain compositions is the same or substantially the same.
According to one embodiment of the invention, the long-chain composition may be manufactured by a manufacturing method. Specifically, for example, the manufacturing method at least comprises the following mixing steps.
Mixing: and mixing the long-chain alkane with the long-chain carboxylic acid according to the mass ratio to obtain the long-chain composition. The mixing is optionally carried out with heating and stirring. As the heating, a heating temperature of 45 to 70 ℃ or 50 to 60 ℃ may be particularly mentioned. Further, as the stirring, a stirring rotation speed of 50 to 250rpm or 150 to 250rpm is particularly exemplified. Further, as the mixing, it is preferable to mix until uniform mixing is obtained until a uniform liquid mixture is obtained.
According to one embodiment of the present invention, water and a pH adjuster are further added in the mixing step according to the manufacturing method. Here, the pH adjuster includes, for example, an alkali, and particularly at least one selected from sodium hydroxide and potassium hydroxide.
According to one embodiment of the invention, the manufacturing method further comprises the step of adding water and a pH adjuster to the long-chain composition. The process is optionally carried out with heating and stirring. As the heating, a heating temperature of 45 to 70 ℃ or 50 to 60 ℃ may be particularly mentioned. Further, as the stirring, a stirring rotation speed of 50 to 250rpm or 150 to 250rpm is particularly exemplified. The pH adjuster includes, for example, an alkali, and particularly at least one selected from sodium hydroxide and potassium hydroxide.
According to one embodiment of the present invention, the mass of the water at the time of addition is generally 0.5 to 10 times, preferably 1 to 5 times or 1 to 3 times the mass of the sum of the mass of the long-chain alkane and the mass of the long-chain carboxylic acid.
According to one embodiment of the invention, the amount of the pH regulator used at the time of addition is generally such that the pH of the long-chain composition reaches 5 to 12, preferably 7 to 10, 7.5 to 9 or 7.5 to 8.0.
According to one embodiment of the present invention, the present invention also relates to a method for producing a long-chain dibasic acid. Here, the long-chain dicarboxylic acid is at least one long-chain dicarboxylic acid selected from C9-18 linear or branched, saturated or unsaturated aliphatic dicarboxylic acids, preferably at least one long-chain dicarboxylic acid selected from C9-18 linear, saturated aliphatic dicarboxylic acids, preferably at least one long-chain dicarboxylic acid selected from dodecanedioic acid, tetradecanedioic acid and hexadecanedioic acid, and particularly dodecanedioic acid.
According to one embodiment of the invention, the manufacturing method comprises the steps of:
(1) providing a long-chain composition or a long-chain composition set (collectively referred to as a long-chain composition) according to any one of the embodiments of the present specification;
(2) and (3) performing a fermentation reaction on the long-chain composition in the presence of zymophyte and a fermentation medium to convert the long-chain composition into the long-chain dibasic acid.
According to an embodiment of the present invention, in the manufacturing method, the fermentation tubes are yeasts having an intact alpha, omega-oxidation pathway, preferably at least one yeast selected from the group consisting of candida, cryptococcus, endospore, hansenula, pichia, rhodotorula, torulopsis and trichosporon, more preferably at least one yeast selected from the group consisting of candida, particularly candida tropicalis, more particularly candida tropicalis (candida tropicalis)Candida tropicalis) The mutant strain PF-uv-56 (China Committee for culture Collection of microorganisms, China, with the collection number of CGMCC No.0356 and the collection date of 31/8/1998) is preserved in the center of microorganisms.
According to an embodiment of the present invention, in the production method, the fermentation medium may be a fermentation medium conventionally used in the art for producing a long-chain dibasic acid by a fermentation method, and generally includes 10 to 60g/L of a carbon source, 1 to 10g/L of a nitrogen source, 1 to 10g/L of a phosphorus source, 0.1 to 50ppm of a trace metal element source, and the like. Here, as the carbon source, for example, one or more selected from glucose, sucrose, maltose, fructose, molasses, glycerol, sorbitol, arabinose, rhamnose, methanol and ethanol may be mentioned. As the nitrogen source, for example, one or more selected from yeast extract, peptone, corn steep liquor, urea, ammonium salt and nitrate may be mentioned. Examples of the phosphorus source include one or more selected from among orthophosphoric acid salt, monohydrogen phosphate and dihydrogen phosphate, and preferably one or more selected from among potassium dihydrogen phosphate, dipotassium hydrogen phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sodium dihydrogen phosphate and disodium hydrogen phosphate. Examples of the trace metal element source include one or more selected from the group consisting of sulfates, hydrochlorides, acetates and nitrates of sodium, potassium, calcium, magnesium, iron, copper, zinc and manganese, and preferably one or more selected from the group consisting of sodium chloride, sodium acetate, potassium chloride, magnesium sulfate, calcium chloride, iron chloride and copper sulfate. In particular, as the composition of the fermentation medium, it is preferable to include: 20 to 28g/L of sucrose, 0.8 to 1.5g/L of corn steep liquor, 2.0 to 4.0g/L of yeast extract, 0.8 to 1.2g/L of sodium chloride, 3.0 to 3.5g/L of monopotassium phosphate, 1.2 to 1.8g/L of magnesium sulfate, 1.2 to 4.8g/L of urea, 1.5 to 2g/L of ammonium sulfate and 1.5 to 1.8g/L of sodium acetate.
According to one embodiment of the present invention, in the manufacturing method, the fermentation reaction includes at least the following two steps.
The preparation method comprises the following steps: mixing the zymophyte and the fermentation culture medium, and carrying out the fermentation reaction for 5-60 hours to obtain a fermentation base liquid. Here, as the reaction time of the preliminary step, preferably 10 to 40 hours, more preferably 20 to 30 hours or 24 hours
A conversion step: adding the long-chain composition to the fermentation base liquid, and performing the fermentation reaction for 60-400 hours to convert the long-chain composition into the long-chain dibasic acid. Here, as the reaction time of the conversion step, 100-300 hours is preferable, and 100 to 160 hours or 100 to 140 hours is more preferable.
According to an embodiment of the present invention, in the manufacturing method, the addition amount (by volume) of the fermentation tubes seed liquid is generally 2 to 30%, preferably 5 to 20% or 10 to 15% of the total liquid preparation volume.
According to an embodiment of the present invention, in the production method, the reaction temperature of the fermentation reaction is generally 25 to 37 ℃, preferably 28 to 32 ℃.
According to an embodiment of the present invention, in the production method, the stirring speed of the fermentation reaction is generally 100 to 1000rpm, preferably 120 to 500rpm or 150 to 300 rpm.
According to an embodiment of the present invention, in the production method, the aeration rate of the fermentation reaction is generally 0.2 to 10.0VVM, preferably 0.2 to 2.0VVM or 0.5 to 1.0 VVM.
According to an embodiment of the present invention, in the production method, the reaction time of the fermentation reaction is generally 65 hours or more, preferably more than 120 hours, more preferably 130 to 400 hours, 130 to 300 hours, 130 to 200 hours, or 138 to 160 hours. Here, the reaction time includes a reaction time of the preliminary step and a reaction time of the conversion step.
According to one embodiment of the invention, the amount of the long-chain composition added in the production process is generally 100 to 1000g/L of total liquid control volume, preferably 100 to 500g/L of total liquid control volume or 150 to 250g/L of total liquid control volume.
According to one embodiment of the invention, in the manufacturing process the fermentation medium is added in an amount of typically 12 to 80g/L total liquid hold volume, preferably 32 to 50g/L total liquid hold volume, 35 to 45g/L total liquid hold volume, or 37 to 42g/L total liquid hold volume.
According to one embodiment of the present invention, according to the production method, in the preliminary step, preferably within 24 hours from the start of the preliminary step, the long-chain composition is not added, and the pH of the fermentation reaction is in an autogenous state, that is, no pH control is performed in this step or during this period.
According to one embodiment of the invention, according to the manufacturing process, the pH of the fermentation reaction is adjusted to between 6.0 and 7.5, preferably between 6.8 and 7.0, at the beginning of the conversion step, preferably 24 hours after the beginning of the preliminary step. More preferably, the pH of the fermentation reaction is subsequently increased by 0.05 to 0.4, preferably 0.1 to 0.3, every 5 to 60 hours, preferably every 10 to 40 hours or every 20 to 30 hours or every 24 hours, until the end of the fermentation reaction.
According to one embodiment of the invention, in the conversion step, the long-chain composition is added in n batches (also called batch feeding), according to the manufacturing process. The time intervals between two consecutive batches can be identical or different, preferably identical. Examples of the time interval include 5 to 60 hours, 10 to 40 hours, 20 to 30 hours, and 24 hours. In addition, n is a positive integer from 2 to 40, preferably from 4 to 20 or from 5 to 10.
According to an embodiment of the present invention, in the converting step, using the set of long-chain compositions according to any one of the embodiments of the present specification, the n long-chain compositions are added in the order of n batches, preferably from 1 st long-chain composition to n th long-chain composition.
According to one embodiment of the present invention, in the conversion step, the long-chain composition (also referred to as a fed-batch) is continuously added according to the reaction time according to the production method. The continuous addition may or may not be a constant flow rate, preferably a constant flow rate.
According to one embodiment of the invention, in said conversion step, said long-chain composition is added continuously according to the function R = f (t), according to said manufacturing process. Where R is the mass ratio of the long-chain alkane to the long-chain carboxylic acid, t is the reaction time of the conversion step, and f () represents any non-increasing function, preferably any decreasing function, any monotonically decreasing function, or any linearly decreasing function.
According to an embodiment of the present invention, the production method further comprises a step of separating the long-chain dibasic acid from a reaction product (referred to as a fermentation broth) of the fermentation reaction. For example, after the fermentation reaction is finished, the long-chain dicarboxylic acid product is obtained after demulsification, membrane filtration, acidification, filtration and drying treatment.
According to an embodiment of the present invention, the demulsification may be performed in any manner conventionally known in the art, and is not particularly limited. As an example, as the demulsification, it is specifically mentioned that the pH of the fermentation broth is adjusted to 8.5 to 10, preferably 9 to 9.5, and the temperature is raised to 75 to 90 ℃ for 20 to 40 min.
According to an embodiment of the present invention, the membrane filtration may be performed in any manner conventionally known in the art, and is not particularly limited. As an example, the membrane filtration may be specifically a membrane filtration of the fermentation liquid after the demulsification, and a solid-liquid separation to obtain a filtrate. Here, the filtration temperature is generally from 30 to 50 ℃ and preferably from 40 to 50 ℃. The pore diameter of the membrane is generally from 10 to 50nm, preferably from 20 to 25 nm.
According to an embodiment of the present invention, the acid precipitation may be performed in any manner conventionally known in the art, and is not particularly limited. As an example, the acid precipitation may be specifically carried out by adjusting the acid pH of the filtrate to 3 to 5, preferably 3 to 4, to precipitate a long-chain dibasic acid. Here, the acidic pH adjuster is generally a strong acid, and may be at least one of sulfuric acid, hydrochloric acid, nitric acid, and the like.
According to an embodiment of the present invention, the filtration may be performed in any manner conventionally known in the art, and is not particularly limited. As an example, the filtration is specifically plate-and-frame filtration. Here, the filtration pressure is generally from 0.5 to 1.0MPa and the filtration temperature is generally room temperature, for example from 20 to 30 ℃.
According to an embodiment of the present invention, the drying may be performed in any manner conventionally known in the art, and is not particularly limited. As an example, the drying temperature is 80 to 105 ℃ and the drying time is 5 to 20 hours.
Examples
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples.
The experimental procedures in the following examples and comparative examples are, unless otherwise specified, conventional in the art. The experimental materials used in the following examples and comparative examples were purchased from biochemical reagent stores, unless otherwise specified.
The calculation formula of the total extraction yield T of the long-chain dibasic acid is as follows:
wherein V is the volume L of clear liquid obtained after the long-chain dibasic acid fermentation liquor is subjected to membrane filtration and unreacted alkane is removed; m is the dry weight of the extracted long-chain dicarboxylic acid, g; c is the lower tank concentration of the long-chain dicarboxylic acid, g/L.
The molar conversion rate K of the mixed substrates is calculated by the formula:
wherein M is the dry weight of the extracted long-chain dicarboxylic acid, g; m1Is the mass of alkane, g; m2Mass of lauric acid, g; m is the molecular weight of the long-chain dibasic acid; m is1Is the molecular weight of the alkane; m is2Lauric acid molecular weight.
The calculation formula of the production strength Q of the long-chain dicarboxylic acid is as follows:
wherein C is the lower tank concentration of the long-chain dicarboxylic acid, g/L; h is the fermentation period, H.
In the embodiment of the invention, candida tropicalis (Candida tropicalis) The mutant strain PF-UV-56 is used as a fermentation strain to carry out long-chain dicarboxylic acid fermentation by long alkane, and is preserved in the China general microbiological culture Collection center with the preservation number of CGMCC No. 0356.
Preparing a fermentation seed solution: inoculating the slant preserved strain into 4 5L shake flasks (shake flask liquid loading amount is 300 mL) for strain activation culture, wherein the culture temperature is 32 ℃, and the rotation number of a culture shaker is 200 rpm. After 48 hours of culture, 1.2L of activated seed solution was taken as a fermentation seed solution.
The formula of the fermentation medium is as follows: 20g/L of sucrose, 0.8g/L of corn steep liquor, 2.0g/L of yeast extract, 0.8g/L of sodium chloride, 3.0g/L of monopotassium phosphate, 1.2g/L of magnesium sulfate, 1.2g/L of urea, 1.5g/L of ammonium sulfate and 1.5g/L of sodium acetate.
Example 1
(1) 1650g of dodecane is taken, 330g of lauric acid is added, the temperature is raised to 60 ℃, the stirring speed is 150rpm, the mixture is mixed and dissolved, then 1980g of water is added, after the mixture is fully mixed, solid sodium hydroxide is added, the pH value of the system is adjusted to 8, and the mixed substrate is obtained.
(2) And (2) carrying out long-chain dibasic acid fermentation in a 15L fermentation tank, wherein the total liquid content is 12L, the fermentation temperature is 32 ℃, the ventilation volume is 1.0VVM, the stirring speed is 250rpm, the pH is not controlled within 0-24h of fermentation, the pH is adjusted to 7.0 after 24h, the pH control value is increased by 0.15 every 24h, and the alkane/lauric acid mixed substrate prepared in the step (1) is added into a fermentation system in 5 batches after 24h, 48h, 72h, 96h and 120h of fermentation.
(3) The fermentation period amounted to 145 h. After fermentation, adjusting the pH of the fermentation liquor to 9.5, heating to 90 ℃, and maintaining for 20 min; performing solid-liquid separation on the demulsified fermentation liquor by membrane filtration to obtain a water-phase clear liquid, wherein the filtration conditions are that the diameter of a membrane hole is 20nm and the filtration temperature is 40 ℃; adding concentrated sulfuric acid into the filtered water phase clear liquid, adjusting the pH to 3, and crystallizing and separating out the long-chain dicarboxylic acid in the water phase clear liquid. And filtering and drying the separated long-chain dibasic acid by a plate frame to obtain a long-chain dibasic acid crude acid product. And (3) filtering conditions: the filtration pressure is 0.5MPa, and the filtration temperature is 30 ℃. The drying condition is that the temperature is 80 ℃ and the drying time is 20 h.
The fermentation results were: in the step (2), the fermentation concentration of the long-chain dibasic acid is 152.0g/L, 13.4L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1914.5g, the extraction yield of the crude acid is 94%, and the molar conversion rate of a mixed substrate of alkane and lauric acid is 62.4%.
Example 2
(1) Adding 190g of lauric acid into 1900g of dodecane, heating to 60 ℃, stirring at the rotation speed of 250rpm for mixing and dissolving, then adding 2090g of water, fully mixing, and adding solid sodium hydroxide to adjust the pH value of the system to 7.5 to obtain a mixed substrate.
(2) And (2) performing long-chain dibasic acid fermentation in a 15L fermentation tank, wherein the total liquid content is 12L, the fermentation temperature is 32 ℃, the ventilation volume is 1.0VVM, the stirring speed is 250rpm, the pH is not controlled within 0-24h of fermentation, the pH is adjusted to 7.0 after 24h, the pH control value is increased by 0.2 every 24h, and the alkane/lauric acid mixed liquid prepared in the step (1) is added into a fermentation system in 5 batches respectively after 24h, 48h, 72h, 96h and 120h of fermentation.
(3) The fermentation period is 150 hours in total. After fermentation, adjusting the pH of the fermentation liquor to 9, heating to 75 ℃, and maintaining for 40 min; performing solid-liquid separation on the demulsified fermentation liquor by membrane filtration to obtain a water-phase clear liquid, wherein the filtration condition is that the diameter of a membrane hole is 25nm, and the filtration temperature is 50 ℃; adding concentrated sulfuric acid into the filtered water phase clear liquid, adjusting the pH to 4, and crystallizing and separating out the long-chain dicarboxylic acid in the water phase clear liquid. And filtering and drying the separated long-chain dibasic acid by a plate frame to obtain a dibasic acid crude acid product. And (3) filtering conditions: the filtration pressure is 1.0MPa, and the filtration temperature is 20 ℃. The drying condition is that the temperature is 105 ℃ and the drying time is 5 h.
The fermentation results were: the fermentation concentration of the long-chain dibasic acid in the step (2) is 156.0 g/L, 13.6L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1973.0g, the extraction yield of the crude acid is 93 percent, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 60.2 percent.
Example 3
(1) 1650g of dodecane is taken, 330g of lauric acid is added, the temperature is raised to 60 ℃, the stirring speed is 150rpm, mixing and dissolving are carried out, 5940g of water is added, after full mixing, solid sodium hydroxide is added, the pH value of the system is adjusted to 8, and the mixed substrate is obtained.
(2) And (2) performing long-chain dibasic acid fermentation in a 15L fermentation tank, wherein the total liquid content is 12L, the fermentation temperature is 32 ℃, the ventilation volume is 1.0VVM, the stirring speed is 250rpm, the pH is not controlled within 0-24h of fermentation, the pH is adjusted to 7.0 after 24h, the pH control value is increased by 0.15 every 24h, and the alkane/lauric acid mixed liquid prepared in the step (1) is added into the fermentation system in a feeding mode at the beginning of 24h of fermentation, and the flow rate is controlled to be 66 g/h.
(3) The fermentation period totaled 144 h. After fermentation, adjusting the pH of the fermentation liquor to 9.5, heating to 90 ℃, and maintaining for 20 min; performing solid-liquid separation on the demulsified fermentation liquor by membrane filtration to obtain a water-phase clear liquid, wherein the filtration conditions are that the diameter of a membrane hole is 20nm and the filtration temperature is 40 ℃; adding concentrated sulfuric acid into the filtered water phase clear liquid, adjusting the pH to 3, and crystallizing and separating out the long-chain dicarboxylic acid in the water phase clear liquid. And filtering and drying the separated long-chain dibasic acid by a plate frame to obtain a long-chain dibasic acid crude acid product. And (3) filtering conditions: the filtration pressure is 0.5MPa, and the filtration temperature is 30 ℃. The drying condition is that the temperature is 80 ℃ and the drying time is 20 h.
The fermentation results were: in the step (2), the fermentation concentration of the long-chain dibasic acid is 153.0 g/L, 13.5L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1941.6g, the extraction yield of the crude acid is 94%, and the molar conversion rate of a mixed substrate of alkane and lauric acid is 63.3%.
Comparative example 1
The difference from example 1 is that in step (1), no alkane and lauric acid mixed substrate is used, and only in step (2), alkane with a total mass of 1980g is added in batches during the fermentation. The fermentation period is 158 hours in total, and the fermentation result is as follows: the fermentation concentration of the long-chain dibasic acid in the step (2) is 150.0 g/L, 13.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acidification, the mass of the crude acid is 1833g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 58.2%.
Comparative example 2
The difference from example 1 is that in step (1), no alkane and lauric acid mixed substrate is used, and lauric acid with a total mass of 1980g is added in batches only during the fermentation in step (2). The fermentation period is 155 hours in total, and the fermentation result is as follows: in the step (2), the fermentation concentration of the long-chain dibasic acid is 15.0 g/L, 12.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid product is 169.2g, the extraction yield of the crude acid is 94%, and the molar conversion rate of a mixed substrate of alkane and lauric acid is 6.3%.
Comparative example 3
The difference from example 1 is that step (1) does not use alkane and lauric acid mixed substrate, but only the alkane with the total mass of 1848g is added in batch during the fermentation process of step (2). The fermentation period is 150 hours in total, and the fermentation result is as follows: the fermentation concentration of the long-chain dibasic acid in the step (2) is 141.0 g/L, 12.9L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1709.8g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 58.2%.
Example 4
The same as example 1, except that in the step (1), the alkane and the lauric acid were stirred and mixed at room temperature, 1980g of water was added, and after thorough mixing, solid sodium hydroxide was added to adjust the pH of the system to 8, thereby obtaining a mixed substrate. The fermentation period is 144h in total, and the fermentation result is as follows: through detection and calculation, the fermentation concentration of the long-chain dibasic acid in the step (2) is 142.0 g/L, 13.2L of fermentation clear liquid is obtained through membrane filtration in the step (3), acid separation is carried out to obtain 1762g of the crude long-chain dibasic acid product, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 57.4%.
Example 5
The difference from example 1 is that after the alkane and lauric acid in step (1) are dissolved in 60 ℃ under stirring, the aqueous solution is prepared without adding water, and the aqueous solution is directly used in the fermentation process in step (2) without pH alkaline adjustment. The fermentation period is 144 hours in total, the fermentation result is that the fermentation concentration of the long-chain dibasic acid in the step (2) is 135.0 g/L, 13.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the extraction yield of the crude acid is 94 percent, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 53.8 percent.
Example 6
The difference from the example 1 is that after the alkane and the lauric acid in the step (1) are stirred and dissolved at 60 ℃, water is added to prepare an aqueous solution, and the aqueous solution is directly used in the fermentation process in the step (2) without pH alkaline adjustment. The fermentation period is 145 hours in total, the fermentation result is that the fermentation concentration of the long-chain dicarboxylic acid in the step (2) is 142.0 g/L, 13.5L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dicarboxylic acid is obtained by acid precipitation, the mass of the crude acid product is 1802g, the extraction yield of the crude acid is 94 percent, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 58.7 percent.
Example 7
(1) 1800g of dodecane is taken, 300g of lauric acid is added, the temperature is raised to 60 ℃, the stirring speed is 150rpm, the mixture is mixed and dissolved, 4200g of water is added, and after the mixture is fully mixed, solid sodium hydroxide is added to adjust the pH value of the system to 7.5, so that a mixed substrate is obtained.
(2) And (2) carrying out long-chain dibasic acid fermentation in a 15L fermentation tank, wherein the total liquid content is 12L, the fermentation temperature is 32 ℃, the ventilation volume is 1.0VVM, the stirring speed is 250rpm, the pH is not controlled within 0-24h of fermentation, the pH is adjusted to 7.0 after 24h, the pH control value is increased by 0.2 every 24h, and the alkane/lauric acid mixed substrate prepared in the step (1) is added into a fermentation system in 5 batches after 24h, 48h, 72h, 96h and 120h of fermentation.
(3) The fermentation period amounted to 153 h. After the fermentation was completed, the extraction of the long-chain dibasic acid was carried out in the same manner as in the step (1) in example 1.
The fermentation results were: the fermentation concentration of the long-chain dibasic acid in the step (2) is 160.0g/L, 13.6L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 2030.4g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 62.2%.
Example 8
(1) Collecting 1650g of dodecane, adding 198g of lauric acid, heating to 60 ℃, stirring at the speed of 150rpm for mixing and dissolving, then adding 1848g of water, fully mixing, and adding solid sodium hydroxide to adjust the pH value of the system to 8 to obtain a mixed substrate.
(2) And (2) carrying out long-chain dibasic acid fermentation in a 15L fermentation tank, wherein the total liquid content is 12L, the fermentation temperature is 32 ℃, the ventilation volume is 1.0VVM, the stirring speed is 250rpm, the pH is not controlled within 0-24h of fermentation, the pH is adjusted to 7.0 after 24h, the pH control value is increased by 0.2 every 24h, and the alkane/lauric acid mixed substrate prepared in the step (1) is added into a fermentation system in 5 batches after 24h, 48h, 72h, 96h and 120h of fermentation.
(3) The fermentation period is 142h in total. After the fermentation was completed, the extraction of the long-chain dibasic acid was carried out in the same manner as in the step (1) in example 1.
The fermentation results were: in the step (2), the fermentation concentration of the long-chain dibasic acid is 148.0g/L, 12.9L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 2048.9g, the extraction yield of the crude acid is 94%, and the molar conversion rate of a mixed substrate of alkane and lauric acid is 62.1%.
Example 9
The same as example 1 except that in step (1), tetradecane and myristic acid were used instead of the combination of alkane and lauric acid in the previous example. The fermentation period is 144 hours in total, the fermentation result is that the fermentation concentration of the long-chain dibasic acid in the step (2) is 115.0 g/L, 13.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass is 1405.3g, the extraction yield of the crude acid is 94%, and the molar conversion rate of a mixed substrate of alkane and lauric acid is 53.2%.
Example 10
The same as example 1 except that in step (1) the combination of alkane and lauric acid in the original example was replaced with hexadecane and palmitic acid. The fermentation period is 144 hours in total, the fermentation result is that the fermentation concentration of the long-chain dibasic acid in the step (2) is 98.0 g/L, 13.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass is 1197.6g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 51.6%.
Example 11
(1) 1650g of dodecane is divided into 5 parts, each of 330g, and then 33.0g, 36.3g, 39.6g, 42.9g and 46.2g of lauric acid are respectively added to form a mixture containing alkane and lauric acid in different proportions, wherein the mixture is numbered 1-5. And the pretreatment of the mixture of alkane and lauric acid was carried out in the same manner as in step (1) of example 1.
(2) The long-chain dibasic acid fermentation process was carried out in the same manner as in the step (2) of example 1, except that the alkane/lauric acid mixed substrate produced in the step (1) was sequentially added to the fermentation system in the order of nos. 1 to 5 at the time of 24 hours, 48 hours, 72 hours, 96 hours, and 120 hours of fermentation.
(3) The fermentation period is 140 hours in total. After the fermentation was completed, crude acid extraction of long-chain dibasic acid was performed according to the step (3) in example 1.
The fermentation results were: in the step (2), the fermentation concentration of the long-chain dibasic acid is 149.0g/L, 13.0L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass is 1820.8g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 63.0%.
Example 12
(1) 1650g of dodecane is divided into 5 parts, each 330g, and then 52.8g, 56.1g, 59.4g, 62.7g and 66.0g of lauric acid are respectively added to form a mixture containing alkane and lauric acid in different proportions, wherein the mixture is numbered 1-5. And the pretreatment of the mixture of alkane and lauric acid was carried out in the same manner as in step (1) of example 1.
(2) The long-chain dibasic acid fermentation process was carried out in the same manner as in the step (2) of example 1, except that the alkane/lauric acid mixed substrate produced in the step (1) was sequentially added to the fermentation system in the order of nos. 1 to 5 at the time of 24 hours, 48 hours, 72 hours, 96 hours, and 120 hours of fermentation.
(3) The fermentation period is 140 hours in total. After the fermentation was completed, crude acid extraction of long-chain dibasic acid was performed according to the step (3) in example 1.
The fermentation results were: the fermentation concentration of the long-chain dibasic acid in the step (2) is 154.0g/L, 13.4L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1939.8g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 64.2%.
Example 13
(1) 1650g of dodecane was divided into 5 parts of 330g, and then 33.0g, 36.3g, 39.6g, 42.9g and 46.2g of lauric acid were added thereto, and after heated and dissolved in the manner of the treatment in step (1) of example 1, water was added thereto to control the total mass to 768 g. Solid sodium hydroxide was further added to adjust the pH of the system to 7.5, resulting in mixtures containing varying proportions of alkane and lauric acid, numbered 1-5.
(2) The long-chain dicarboxylic acid fermentation process was performed according to the procedure (2) of example 1, except that the alkane/lauric acid mixed substrate produced in the procedure (1) was sequentially added to the fermentation system at a constant flow rate in the order of numbers 1 to 5 within the time ranges of 24h to 48h, 48h to 72h, 72h to 96h, 96h to 120h, and 120h to 144h, respectively, and the flow rate was controlled to be 32 g/h.
(3) The fermentation period totaled 144 h. After the fermentation was completed, crude acid extraction of long-chain dibasic acid was performed according to the step (3) in example 1.
The fermentation results were: the fermentation concentration of the long-chain dibasic acid in the step (2) is 152.0g/L, 13.2L of fermentation clear liquid is obtained by membrane filtration in the step (3), the crude acid product of the long-chain dibasic acid is obtained by acid precipitation, the mass of the crude acid is 1886.0g, the extraction yield of the crude acid is 94%, and the molar conversion rate of the mixed substrate of alkane and lauric acid is 65.3%.