Enzyme-method esterification deacidification technology for rice bran oil with high acid value

A high-acid value rice bran oil, enzymatic esterification technology, applied in fatty acid esterification, fat oil/fat refining, fat production, etc., can solve the problems of high reaction temperature, environmental pollution, low efficiency, etc., and achieve mild catalytic conditions , high catalytic efficiency and convenient operation

Inactive Publication Date: 2015-07-15
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, alkali refining deacidification requires a large amount of water and chemicals, resulting in high oil refining consumption, lowering the nutritional quality of oil, and a large amount of organic wastewater generated by deacidification, which pollutes the environment; the physical refining method has a low refining rate and the oil The loss of accompanying substances is large, and the process has strict requirements on equipment; the existing patent CN101319167B "High acid value rice bran oil esterification and deacidification" uses zinc oxide as a

Method used

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  • Enzyme-method esterification deacidification technology for rice bran oil with high acid value
  • Enzyme-method esterification deacidification technology for rice bran oil with high acid value
  • Enzyme-method esterification deacidification technology for rice bran oil with high acid value

Examples

Experimental program
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Effect test

Embodiment 1

[0034]Firstly, the high-acid value rice bran crude oil is centrifuged at a speed of 4000-5000r / min for 10-15 minutes, and then the centrifuged high-acid value rice bran crude oil is vacuum-filtered using a Buchner funnel to remove the crude rice bran oil. impurities, then stir and heat the high-acid value rice bran crude oil obtained after centrifugation and filtration to 70-80°C, add 0.1%-0.3% of the weight of the high-acid value rice bran crude oil and phosphoric acid with a solubility of 85%, And heat preservation and stirring for 25 to 35 minutes, then add 5% of the weight of high acid value rice bran crude oil in hot water at the same temperature, continue to stir for 50 to 70 minutes, let stand for 3.5 to 4.5 hours, and centrifuge at a speed of 4000 to 5000r / min Degumming in 10-15 minutes to obtain high-acid rice bran oil with an acid value of 39.66mgKOH / g; then, under a vacuum of 0.085MPa, stir and heat the obtained high-acid rice bran oil to 50°C, and add 250% of the th...

Embodiment 2

[0035] Under the vacuum degree of 0.085MPa, stir and heat high-acid rice bran oil with an acid value of 46.41 mgKOH / g to 60°C, add 200% of the theoretical glycerin amount of glycerin, and then add 3% of the oil weight catalyst Lipozyme 435, When the catalytic reaction was performed for 12 hours, the other steps were the same as in Example 1, and the acid value of rice bran oil could be reduced from 46.41 mgKOH / g to 1.87 mgKOH / g.

Embodiment 3

[0037] Under the vacuum degree of 0.085MPa, stir and heat high-acid rice bran oil with an acid value of 49.76 mgKOH / g to 60°C, add 250% of the theoretical glycerin amount of glycerin, and then add 3% of the oil weight catalyst Lipozyme 435, When the catalytic reaction was performed for 12 hours, the other steps were the same as in Example 1, and the acid value of rice bran oil could be reduced from 49.76 mgKOH / g to 1.12 mgKOH / g.

[0038] The enzymatic esterification and deacidification process of high-acid rice bran oil provided by the present invention is to use Lipozyme 435 immobilized lipase to catalyze the esterification reaction of free fatty acids and glycerol in high-acid rice bran oil under a certain degree of vacuum and temperature. Thereby reducing the content of free fatty acids and reducing the acid value of rice bran oil to below 3mgKOH / g; Lipozyme 435 immobilized lipase is food-grade, with mild catalytic conditions and high catalytic efficiency. At the same time, ...

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Abstract

The invention discloses an enzyme-method esterification deacidification technology for rice bran oil with a high acid value. The technology comprises the following steps: step one, obtaining rice bran oil with a high acid value; step two, carrying out enzyme-method esterification deacidification: heating the rice bran oil obtained in the step one under stirring in vacuum, adding glycerin and Lipozyme 435 immobilized lipase, carrying out esterification reactions between rice bran oil and glycerin in the presence of Lipozyme 435 immobilized lipase so as to obtain the de-acidified rice bran oil; step three, obtaining rice bran oil with a low acid value. In the provided technology, under a certain vacuum degree and temperature, the Lipozyme 435 immobilized lipase is used to catalyze the esterification reactions between the free aliphatic acids in rice bran oil with a high acid value and the glycerin so as to reduce the content of the free aliphatic acids, and thus the acid value of the rice bran oil can be reduced to below 3 mgKOH/g. The provided technology has the advantages of safety, environment-friendliness, low cost, and high refining yield, and is suitable for being applied to edible oil production.

Description

technical field [0001] The invention relates to a process for deacidifying oil, in particular to a process for enzymatic esterification and deacidification of high-acid rice bran oil. Background technique [0002] Rice bran oil is a kind of oil produced by pressing or leaching rice bran, a by-product of rice processing. It contains a reasonable composition of unsaturated fatty acids, including 38% linoleic acid and 42% oleic acid. The ratio is about 1:1.1, which is in line with international health The optimal ratio recommended by the organization, and rice bran oil is also rich in oryzanol, vitamin E, squalene, phytosterols, compound lipids and more than a dozen natural bioactive ingredients, and is known as "nutrition and health care oil" by nutritionists. ". Edible rice bran oil can promote the metabolism of cholesterol and lipids, effectively lower cholesterol, prevent atherosclerosis, and prevent cardiovascular and cerebrovascular diseases. At the same time, it also h...

Claims

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Application Information

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IPC IPC(8): C11B3/00C11C3/06
CPCC11B3/001C11B3/003C11B3/008C11B3/04C11C3/06
Inventor 何东平胡传荣罗质张四红姚理万聪
Owner WUHAN POLYTECHNIC UNIVERSITY
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