阅读说明：本技术 一种利用椰子油制备mct油的方法 (Method for preparing MCT oil by using coconut oil ) 是由 李红军 于 2019-11-21 设计创作，主要内容包括：本发明属于特种油脂合成领域,具体涉及一种利用椰子油制备MCT油的方法。利用椰子油水解获得混合脂肪酸和甘油水,之后对混合脂肪酸处理得到辛酸、葵酸,对甘油水处理获得甘油,之后利用辛酸、葵酸与甘油反应获得MCT油。本发明仅仅以椰子油为原料,以其水解后有效成分再合成MCT油,此工艺生产的MCT油成本较低,收率合理,质量有保证。(The invention belongs to the field of special grease synthesis, and particularly relates to a method for preparing MCT oil by using coconut oil. The coconut oil is hydrolyzed to obtain mixed fatty acid and glycerin water, then the mixed fatty acid is treated to obtain caprylic acid and capric acid, the glycerin water is treated to obtain glycerin, and finally the caprylic acid and capric acid are reacted with the glycerin to obtain MCT oil. The invention only takes the coconut oil as the raw material, and synthesizes MCT oil by using the hydrolyzed effective components, and the MCT oil produced by the process has the advantages of lower cost, reasonable yield and guaranteed quality.)

1. A method for preparing MCT oil by using coconut oil is characterized in that coconut oil is hydrolyzed to obtain mixed fatty acid and glycerol water, then the mixed fatty acid is treated to obtain caprylic acid and capric acid, the glycerol water is treated to obtain glycerol, and finally the caprylic acid, capric acid and glycerol are reacted to obtain the MCT oil.

2. A process for the preparation of MCT oil from coconut oil as claimed in claim 1 wherein crude MCT oil is obtained by reacting caprylic acid, capric acid and glycerol: mixing glycerol and caprylic-capric acid according to the mass ratio of 1:5.5, carrying out esterification reaction under the action of a catalyst, wherein the initial reaction temperature is 140 ℃, the initial vacuum is 3kPa, slowly heating up to 260 ℃ at the speed of 15 ℃/h during stirring, then adjusting the vacuum to 1kPa, keeping the temperature, continuing to react for 1-1.5h, and then cooling to 60-70 ℃ to obtain crude MCT oil; the catalyst comprises the following components in percentage by mass: 30-40% of zinc chloride, 50-60% of zinc sulfate and 10-12% of zinc; the addition amount of the catalyst is 3-5% of the total mass of the glycerol and the caprylic-capric acid.

3. A process for the preparation of MCT oil from coconut oil as claimed in claim 2 where the glycerin is preheated to 120-130 ℃ before being mixed with caprylic acid and capric acid.

4. A process for the preparation of MCT oil from coconut oil as claimed in claim 2, wherein the crude MCT oil obtained is purified as follows: filtering the crude MCT oil, adding alkali liquor, stirring for 40-50min, centrifuging, washing the collected light liquid with water, decolorizing, and deodorizing to obtain refined MCT oil.

5. The method for preparing MCT oil by using coconut oil as claimed in claim 4, wherein the water is added for 1-2 times, the amount of water added for each time is 10-15% of the MCT oil, and the stirring time is 15-20 min.

6. The method for preparing MCT oil from coconut oil as claimed in claim 4, wherein the MCT oil is stirred for 0.5h at 95-98 ℃ and under vacuum 3kPa before decolorization, and then activated carbon with the weight of 0.3-1% of that of the MCT oil is added, the decolorization temperature is 115-120 ℃, the decolorization vacuum is 2660Pa, and the stirring decolorization is 40 min.

7. The process for preparing MCT oil using coconut oil as claimed in claim 4, wherein refined MCT oil is obtained by filtering and separating to remove gas after decolorizing, deodorizing at 240 ℃ under vacuum 800Pa for 90min, and cooling to 40 ℃.

8. A process for preparing MCT oil from coconut oil as claimed in any one of claims 1-7, wherein during the hydrolysis of coconut oil, methanesulfonic acid 5% by mass of coconut oil and concentrated sulfuric acid 10% by mass of coconut oil at 98% concentration are added as catalysts, and the mixture is hydrolyzed at 80-85 ℃ for 18-20h at an oil-water ratio of 1:1.5 to obtain crude fatty acid and glycerol water.

9. The process for preparing MCT oil from coconut oil as claimed in claim 8, wherein the glycerol is purified, evaporated, desalted to obtain crude glycerol, the crude glycerol is treated at distillation pressure of 360Pa and temperature of 161.5 ℃ to obtain pure glycerol, and then activated carbon is added to decolorize to obtain refined glycerol.

Technical Field

The invention belongs to the field of special grease synthesis, and particularly relates to a method for preparing MCT oil by using coconut oil.

Background

MCT oil is medium-chain fatty acid glyceride. MCT oil is colorless transparent liquid at room temperature, slightly has the fragrance of coconut oil, belongs to derivatives of coconut oil or palm oil, has small relative molecular weight and good water solubility due to short carbon chain, is a few oil bodies which can be mutually dissolved with water, has no harm to tissues such as human skin and the like, has low melting point (-15 ℃), high boiling point, small density and low viscosity which is about 50 percent of that of common vegetable oil. The MCT oil has extremely low unsaturated fatty acid content, iodine value of not more than 0.5, excellent physical and chemical properties compared with vegetable oil and animal oil, extremely high antioxidant temperature and extremely low crystallization resistance, excellent carrier for biological preparation and chemical synthetic medicine, small surface tension and easy diffusion of medicine, so that the MCT oil has wide application value. The existing MCT oil production process is mostly controlled by America and European companies, the production process cost is high, the production formula is confidential, and the implementation is difficult.

Disclosure of Invention

The invention aims to provide a method for preparing MCT oil from coconut oil, which has wide raw material source and simple and controllable preparation process.

The technical scheme adopted by the invention is as follows:

a method for preparing MCT oil from coconut oil comprises hydrolyzing coconut oil to obtain mixed fatty acid and glycerol water, treating the mixed fatty acid to obtain caprylic acid and capric acid, treating the glycerol water to obtain glycerol, and reacting caprylic acid, capric acid and glycerol to obtain MCT oil.

When coconut oil is hydrolyzed, methanesulfonic acid with the mass of 5% of coconut oil and concentrated sulfuric acid with the mass of 10% (98 wt%) are added as catalysts, and the mixture is hydrolyzed at the temperature of 80-85 ℃ for 18-20h at the oil-water ratio of 1:1.5 to obtain mixed fatty acid and glycerol water.

Fractionating the mixed fatty acid to obtain caprylic acid and capric acid.

The mixed fatty acid is rich in caprylic acid and capric acid, wherein caprylic acid accounts for about 9.6% of total fatty acids, capric acid accounts for about 6.3% of total fatty acids, and the crude fatty acid can be fractionated to obtain high-quality caprylic acid and capric acid.

Purifying, evaporating and desalting the glycerin water to obtain crude glycerin.

Further, the crude glycerol is treated under the distillation pressure of 360Pa and at the temperature of 161.5 ℃ to obtain pure glycerol with the concentration of 98.5 percent, and then active carbon is added for decolorization to obtain refined glycerol.

Further, crude MCT oil is first obtained by reacting caprylic acid, capric acid and glycerol: mixing glycerol and caprylic-capric acid according to the mass ratio of 1:5.5, carrying out esterification reaction under the action of a catalyst, wherein the initial reaction temperature is 140 ℃, the initial vacuum is 3kPa, slowly heating up to 260 ℃ at the speed of 15 ℃/h during stirring, then adjusting the vacuum to 1kPa, keeping the temperature, continuing to react for 1-1.5h, and cooling to 60-70 ℃ to obtain crude MCT oil.

The catalyst comprises the following components in percentage by mass: 30-40% of zinc chloride, 50-60% of zinc sulfate and 10-12% of zinc; the addition amount of the catalyst is 3-5% of the total mass of the glycerol and the caprylic-capric acid

Preferably, the glycerol is preheated to 120-130 ℃ and then mixed with the caprylic-capric acid.

The crude MCT oil obtained was purified as follows: filtering the crude MCT oil, adding alkali liquor, stirring for 40-50min, centrifuging, washing the collected light liquid with water, decolorizing, and deodorizing to obtain refined MCT oil.

The water washing process comprises the following steps: washing with water for 1-2 times, wherein the water addition amount is 10-15% of MCT oil each time, and stirring for 15-20 min.

Stirring at 95-98 deg.C under vacuum 3kPa for 0.5h before decolorizing, adding 0.3-1% of MCT oil by weight of activated carbon, decolorizing at 115-120 deg.C under vacuum 2660Pa, and stirring for 40 min.

Decolorizing, filtering, separating to remove gas, deodorizing at 240 deg.C under vacuum 800Pa for 90min, and cooling to 40 deg.C to obtain refined MCT oil.

Specifically, the method for preparing MCT oil by using coconut oil comprises the following steps:

1) hydrolysis: using refined coconut oil as a raw material, using methanesulfonic acid with the mass of 5% of oil and concentrated sulfuric acid with the mass of 10% (98%) as a catalyst, and hydrolyzing for 20 hours at 80 ℃ with an oil-water ratio (mass ratio) of 1:1.5 to obtain crude fatty acid and glycerol water;

2) fractionating crude fatty acid to obtain caprylic acid and capric acid: the obtained crude fatty acid is fractionated under negative pressure, the fractionation pressure is 360Pa, and the fractionation temperature is 121.5 ℃ to obtain caprylic acid; the fractionation pressure is 360Pa, and the fractionation temperature is 143.3 ℃ to obtain the decanoic acid;

3) obtaining glycerol from glycerol water: purifying, evaporating and desalting the glycerol water obtained in the step 1) to obtain crude glycerol with the mass content of 80%, distilling the crude glycerol at the distillation pressure of 360Pa and the temperature of 161.5 ℃ to obtain pure glycerol with the mass content of 98.5wt%, and adding activated carbon for decoloring to obtain refined glycerol;

4) mixing glycerol and caprylic-capric acid at a ratio of 1:5.5, carrying out esterification reaction, wherein the initial reaction temperature is 140 ℃, the initial vacuum is 3kPa, slowly heating up to 260 ℃ at a speed of 15 ℃/h during stirring, then regulating the vacuum to 1kPa, keeping the temperature, continuing to react for 1-1.5h, and cooling to 60-70 ℃ to obtain the crude MCT oil. And refining the crude MCT oil by alkali refining, decoloring by active carbon, deodorizing, cooling and finely filtering to obtain refined MCT oil.

Has the advantages that:

the method comprises the steps of obtaining caprylic acid and capric acid by using mixed fatty acid obtained by hydrolyzing coconut oil through a fractionation process, obtaining crude glycerol by using glycerol water obtained by hydrolyzing coconut oil through purification, evaporation and desalination, heating the crude glycerol and caprylic/capric acid for esterification reaction by using the refined glycerol, adding a catalyst to obtain crude MCT oil, refining the crude MCT oil through alkali refining, decoloring the activated carbon, deodorizing, cooling and fine filtering to obtain the refined MCT oil. The method has the innovation that only the coconut oil is taken as the raw material, and the MCT oil is synthesized by the hydrolyzed effective components, so that the MCT oil produced by the process has the advantages of low cost and reasonable yield, the yield of the MCT oil is 13-14% of that of the coconut oil, and the quality is ensured.

Detailed Description

The technical solution of the present invention is illustrated by the following specific examples, but the scope of the present invention is not limited thereto: