阅读说明：本技术 一种高速率的焦磷酸二氢二钠生产方法 (High-rate disodium dihydrogen pyrophosphate production method ) 是由 钟正林 孟永昆 朱珠 于 2021-07-16 设计创作，主要内容包括：本发明涉及焦磷酸二氢二钠生产技术领域,且公开了一种高速率的焦磷酸二氢二钠生产方法,包括以下步骤：焦磷酸二氢二钠的中和、喷雾干燥、聚合、冷却、破碎、筛分、包装和测试,得到高发气速率的焦磷酸二氢二钠。该高速率的焦磷酸二氢二钠生产方法,将氢氧化钠、生活用水和食品磷酸混合后得到的中和液的PH值调整到3.5～3.8的范围内,再将比重控制在1.5～1.55,再往中和液中加入5‰的比例的焦磷酸钾,同时再通过高压泵打入喷粉盐,将中和液在干燥塔中进行喷雾干燥处理,再经过聚合炉进行聚合形成焦磷酸二氢二钠粉末,再通过冷却、破碎和筛分后,得到高发气率的焦磷酸二氢二钠,同时得到的焦磷酸二氢二钠的稳定性较好,ROR的数值变化幅度较低,品质更高。(The invention relates to the technical field of disodium dihydrogen pyrophosphate production, and discloses a high-rate disodium dihydrogen pyrophosphate production method, which comprises the following steps: neutralization of disodium dihydrogen pyrophosphate, spray drying, polymerization, cooling, crushing, screening, packaging and testing to obtain disodium dihydrogen pyrophosphate with high gassing rate. The method for producing disodium dihydrogen pyrophosphate with high rate comprises the steps of adjusting the pH value of a neutralization solution obtained by mixing sodium hydroxide, domestic water and food phosphoric acid to be within the range of 3.5-3.8, controlling the specific gravity to be 1.5-1.55, adding potassium pyrophosphate with the proportion of 5 per mill into the neutralization solution, pumping the neutralization solution into a powder spraying salt through a high-pressure pump, carrying out spray drying treatment on the neutralization solution in a drying tower, polymerizing the neutralization solution in a polymerization furnace to form disodium dihydrogen pyrophosphate powder, cooling, crushing and screening to obtain disodium dihydrogen pyrophosphate with high gas evolution rate, wherein the obtained disodium dihydrogen pyrophosphate has good stability, the ROR value change range is low, and the quality is high.)

1. A high-rate disodium dihydrogen pyrophosphate production method is characterized by comprising the following steps of: neutralization of disodium dihydrogen pyrophosphate, spray drying, polymerization, cooling, crushing, screening, packaging and testing to obtain disodium dihydrogen pyrophosphate with high gassing rate.

2. The method of producing disodium dihydrogen pyrophosphate according to claim 1, wherein: the neutralization process of the disodium dihydrogen pyrophosphate comprises the following steps: adding sodium hydroxide, domestic water and food phosphoric acid into a neutralization reaction kettle, performing neutralization reaction through the sodium hydroxide and the food phosphoric acid, adding a trace amount of food phosphoric acid or domestic water in a neutralization stage, finely adjusting a neutralization solution to control the pH value of the neutralization solution to be 3.5-3.8, controlling the specific gravity to be 1.5-1.55, and adding potassium pyrophosphate into the neutralization solution according to the proportion of 5 per thousand to obtain the neutralization solution meeting the requirements.

3. The method of producing disodium dihydrogen pyrophosphate according to claim 1, wherein: the spray drying process of the disodium dihydrogen pyrophosphate comprises the following steps: and pumping the neutralization solution into powder spraying salt through a high-pressure pump device, then carrying out spray drying treatment on the neutralization solution in a drying tower, wherein the drying treatment temperature is 140-150 ℃, and the neutralization solution is dried to form anhydrous sodium dihydrogen phosphate powder.

4. The method of producing disodium dihydrogen pyrophosphate according to claim 1, wherein: the polymerization process of the disodium dihydrogen pyrophosphate comprises the following steps: the anhydrous sodium dihydrogen phosphate powder obtained after drying by the drying tower is sent into a polymerization furnace, the temperature in the polymerization furnace is 200-210 ℃, polymerization is carried out under the condition of 200-210 ℃, and the time is controlled to be 30-50 minutes.

5. The method of producing disodium dihydrogen pyrophosphate according to claim 1, wherein: the cooling, crushing, screening and packaging processes of the disodium dihydrogen pyrophosphate comprise the following steps: and (3) packaging the polymerized disodium dihydrogen pyrophosphate after cooling, crushing and screening.

6. The method of producing disodium dihydrogen pyrophosphate according to claim 1, wherein: test procedure of the disodium dihydrogen pyrophosphate: sampling disodium dihydrogen pyrophosphate formed by polymerization in a polymerization furnace, dissolving the disodium dihydrogen pyrophosphate in water to form a disodium dihydrogen pyrophosphate aqueous solution, dripping silver nitrate into the disodium dihydrogen pyrophosphate aqueous solution to produce white precipitates, and sampling and analyzing an ROR value to obtain the ROR value of 36-42.

Technical Field

The invention relates to the technical field of disodium dihydrogen pyrophosphate production, in particular to a high-rate disodium dihydrogen pyrophosphate production method.

Background

Disodium dihydrogen pyrophosphate is an inorganic substance, has a chemical formula of Na2H2P2O7, is white crystalline powder, has a relative density of 1.862, is decomposed into sodium metaphosphate when being heated to more than 220 ℃, is easy to dissolve in water, can form a chelate with Cu2+ and Fe2+, is prepared by heating and hydrolyzing aqueous solution and dilute sulfuric acid diluted inorganic acid into phosphoric acid, and is prepared by heating and dehydrating sodium dihydrogen phosphate to 200 ℃ or adding sodium carbonate into the phosphoric acid, heating and dehydrating to 200 ℃, and can be used as a moisture retention agent, a pH regulator and a metal chelating agent, and is an acid salt, generally, the sodium pyrosulfite is not used independently and is often mixed with sodium pyrosulfite (alkaline salt which has specific action with protein in meat and can obviously enhance the water holding capacity of the meat), and the sodium pyrosulfite reacts with sodium bicarbonate to generate carbon dioxide which can be used as a raw material of quick fermentation powder and can be eaten as a food additive.

However, the application and the demand of the existing disodium dihydrogen pyrophosphate in some baking products are getting bigger, the production of the required 40-type disodium dihydrogen pyrophosphate with high gassing rate is difficult, meanwhile, the disodium dihydrogen pyrophosphate is a slightly acidic heat-sensitive material, the temperature control range of the disodium dihydrogen pyrophosphate is smaller, and metaphosphate is easily generated, so that the produced disodium dihydrogen pyrophosphate is difficult to dissolve in water, meanwhile, the quality of the product is not high, the high gassing rate is difficult to achieve in later use, the solubility is also poor, the expected effect cannot be achieved in use, and the use condition required in the prior art cannot be met.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-speed disodium dihydrogen pyrophosphate production method, which aims to solve the problems that the application and the requirement of the existing disodium dihydrogen pyrophosphate in some baked products are increasingly large, the production of 40 type disodium dihydrogen pyrophosphate with high gassing rate required is difficult, the disodium dihydrogen pyrophosphate is a slightly acidic heat-sensitive material, the temperature control range is small, the partial phosphate is easily generated, the produced disodium dihydrogen pyrophosphate is difficult to dissolve in water, the quality of the product is not high, the high gassing rate is difficult to achieve in later use, the solubility is poor, the expected effect cannot be achieved in use, and the existing required use conditions cannot be met.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a high-rate disodium dihydrogen pyrophosphate production method comprises the following steps: neutralization of disodium dihydrogen pyrophosphate, spray drying, polymerization, cooling, crushing, screening, packaging and testing to obtain disodium dihydrogen pyrophosphate with high gassing rate.

Preferably, the neutralization process of disodium dihydrogen pyrophosphate comprises the following steps: adding sodium hydroxide, domestic water and food phosphoric acid into a neutralization reaction kettle, performing neutralization reaction through the sodium hydroxide and the food phosphoric acid, adding a trace amount of food phosphoric acid or domestic water in a neutralization stage, finely adjusting a neutralization solution to control the pH value of the neutralization solution to be 3.5-3.8, controlling the specific gravity to be 1.5-1.55, and adding potassium pyrophosphate into the neutralization solution according to the proportion of 5 per thousand to obtain the neutralization solution meeting the requirements.

Preferably, the spray drying process of disodium dihydrogen pyrophosphate comprises: and pumping the neutralization solution into powder spraying salt through a high-pressure pump device, then carrying out spray drying treatment on the neutralization solution in a drying tower, wherein the drying treatment temperature is 140-150 ℃, and the neutralization solution is dried to form anhydrous sodium dihydrogen phosphate powder.

Preferably, the polymerization process of the disodium dihydrogen pyrophosphate comprises the following steps: the anhydrous sodium dihydrogen phosphate powder obtained after drying by the drying tower is sent into a polymerization furnace, the temperature in the polymerization furnace is 200-210 ℃, polymerization is carried out under the condition of 200-210 ℃, and the time is controlled to be 30-50 minutes.

Preferably, the cooling, crushing, screening and packaging process of the disodium dihydrogen pyrophosphate comprises the following steps: and (3) packaging the polymerized disodium dihydrogen pyrophosphate after cooling, crushing and screening.

Preferably, the test procedure of disodium dihydrogen pyrophosphate is as follows: sampling disodium dihydrogen pyrophosphate formed by polymerization in a polymerization furnace, dissolving the disodium dihydrogen pyrophosphate in water to form a disodium dihydrogen pyrophosphate aqueous solution, dripping silver nitrate into the disodium dihydrogen pyrophosphate aqueous solution to produce white precipitates, and sampling and analyzing an ROR value to obtain the ROR value of 36-42.

Compared with the prior art, the invention provides a high-speed disodium dihydrogen pyrophosphate production method, which has the following beneficial effects:

the method for producing disodium dihydrogen pyrophosphate with high rate comprises the steps of adjusting the pH value of a neutralization solution obtained by mixing sodium hydroxide, domestic water and food phosphoric acid to be within the range of 3.5-3.8, controlling the specific gravity to be 1.5-1.55, adding 5 per thousand of potassium pyrophosphate into the neutralization solution to improve the quality of the neutralization solution, so as to improve the quality of the neutralization solution, achieving the required mixing ratio and pH value, pumping spraying powder salt into the neutralization solution through a high-pressure pump, performing spray drying treatment on the neutralization solution in a drying tower, polymerizing the neutralization solution in a polymerization furnace to form disodium dihydrogen pyrophosphate powder, and performing supercooling, crushing and screening to obtain disodium dihydrogen pyrophosphate with high gas generation rate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

the method comprises the following steps: and (2) neutralizing, adding 1000 kg of sodium hydroxide with the content of 25% and 1100 kg of food phosphoric acid with the content of 75% into a neutralization reaction kettle, performing neutralization reaction through the sodium hydroxide and the food phosphoric acid, adding a small amount of domestic water in a neutralization stage, finely adjusting a neutralization solution through the domestic water to ensure that the pH value of the neutralization solution is 3.5, adjusting the specific gravity of the neutralization solution to be 1.5 by using the domestic water, and adding potassium pyrophosphate into the neutralization solution according to the proportion of 5 per thousand to obtain the neutralization solution meeting the requirement.

Step two: and (3) spray drying, namely pumping the neutralization solution into the powder spraying salt through a high-pressure pump device, then carrying out spray drying treatment on the neutralization solution in a drying tower, wherein the temperature of the drying treatment is 140 ℃, and the neutralization solution is dried to form anhydrous sodium dihydrogen phosphate powder.

Step three: and (3) carrying out polymerization, namely feeding anhydrous sodium dihydrogen phosphate powder obtained after drying by a drying tower into a polymerization furnace, wherein the temperature in the polymerization furnace is 200 ℃, and the polymerization is carried out under the condition of 200 ℃ for 30 minutes.

Step four: cooling, crushing, screening and packaging, wherein the polymerized disodium dihydrogen pyrophosphate is cooled, crushed and screened and then packaged.

Step five: in the test, disodium dihydrogen pyrophosphate formed by polymerization in a polymerization furnace was sampled, and then disodium dihydrogen pyrophosphate was dissolved in water to form an aqueous disodium dihydrogen pyrophosphate solution, and silver nitrate was dropped into the aqueous disodium dihydrogen pyrophosphate solution, at which time a white precipitate was produced, and at the same time, a ROR value was obtained by sampling and analyzing the ROR value, and it was 38.

Example two:

the method comprises the following steps: and (2) neutralizing, adding 1000 kg of sodium hydroxide with the content of 30% and 1100 kg of food phosphoric acid with the content of 70% into a neutralization reaction kettle, performing neutralization reaction through the sodium hydroxide and the food phosphoric acid, adding a small amount of domestic water in a neutralization stage, finely adjusting a neutralization solution through the domestic water to ensure that the pH value of the neutralization solution is 3.7, adjusting the specific gravity of the neutralization solution to be 1.52 by using the domestic water, and adding potassium pyrophosphate into the neutralization solution according to the proportion of 5 per thousand to obtain the neutralization solution meeting the requirement.

Step two: and (3) spray drying, namely pumping the neutralization solution into the powder spraying salt through a high-pressure pump device, then carrying out spray drying treatment on the neutralization solution in a drying tower, wherein the temperature of the drying treatment is 145 ℃, and the neutralization solution is dried to form anhydrous sodium dihydrogen phosphate powder.

Step three: and (3) carrying out polymerization, namely feeding anhydrous sodium dihydrogen phosphate powder obtained after drying by a drying tower into a polymerization furnace, wherein the temperature in the polymerization furnace is 205 ℃, and the polymerization is carried out under the condition of 205 ℃ for 40 minutes.

Step four: cooling, crushing, screening and packaging, wherein the polymerized disodium dihydrogen pyrophosphate is cooled, crushed and screened and then packaged.

Step five: in the test, disodium dihydrogen pyrophosphate formed by polymerization in a polymerization furnace was sampled, and then disodium dihydrogen pyrophosphate was dissolved in water to form an aqueous disodium dihydrogen pyrophosphate solution, and silver nitrate was dropped into the aqueous disodium dihydrogen pyrophosphate solution, at which time a white precipitate was produced, and at the same time, a ROR value was obtained by sampling and analyzing the ROR value, and it was 40.

Example three:

the method comprises the following steps: and (2) neutralizing, adding 1000 kg of sodium hydroxide with the content of 35% and 1100 kg of food phosphoric acid with the content of 70% into a neutralization reaction kettle, performing neutralization reaction through the sodium hydroxide and the food phosphoric acid, adding a small amount of domestic water in a neutralization stage, finely adjusting a neutralization solution through the domestic water to ensure that the pH value of the neutralization solution is 3.8, adjusting the specific gravity of the neutralization solution to be 1.55 by using the domestic water, and adding potassium pyrophosphate into the neutralization solution according to the proportion of 5 per thousand to obtain the neutralization solution meeting the requirement.

Step two: and (3) spray drying, namely pumping the neutralization solution into the powder spraying salt through a high-pressure pump device, then carrying out spray drying treatment on the neutralization solution in a drying tower, wherein the temperature of the drying treatment is 150 ℃, and the neutralization solution is dried to form anhydrous sodium dihydrogen phosphate powder.

Step three: and (3) polymerization, namely feeding anhydrous sodium dihydrogen phosphate powder obtained after drying by a drying tower into a polymerization furnace, wherein the temperature in the polymerization furnace is 210 ℃, and polymerization is carried out at 210 ℃ for 50 minutes.

Step four: cooling, crushing, screening and packaging, wherein the polymerized disodium dihydrogen pyrophosphate is cooled, crushed and screened and then packaged.

Step five: in the test, disodium dihydrogen pyrophosphate formed by polymerization in a polymerization furnace was sampled, and then disodium dihydrogen pyrophosphate was dissolved in water to form an aqueous disodium dihydrogen pyrophosphate solution, and silver nitrate was dropped into the aqueous disodium dihydrogen pyrophosphate solution, at which time a white precipitate was produced, and at the same time, a ROR value was sampled and analyzed, and the ROR value was 42.

In summary, in the first to third embodiments, disodium dihydrogen pyrophosphate with high gassing rate can be obtained by maintaining the temperature in the drying tower at 140 to 150 ℃ and the temperature in the polymerization furnace at 200 to 210 ℃, and the high gassing rate of the disodium dihydrogen pyrophosphate prepared in the second embodiment can be maintained at 40 as required, so that the production requirements are met, the disodium dihydrogen pyrophosphate is in a stable state, and high-quality disodium dihydrogen pyrophosphate is produced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.