High-acid value rice bran oil esterification depickling process
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A high-acid value rice bran oil, esterification and deacidification technology, applied in the direction of fatty acid esterification, fat oil/fat refining, fat production, etc., to achieve the effect of cheap price, good repeatable catalytic ability, and reduce production cost
Inactive Publication Date: 2008-12-10
HEFEI UNIV OF TECH
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[0005] In order to solve the above-mentioned problems existing in the deacidification of the existing esterification method
Method used
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[0019] Example 1:
[0020] The high acid value rice bran oil esterification deacidification process comprises the following process steps:
[0021] A. Grease pretreatment
[0022] (1), degumming
[0023] With 50g of crude rice bran oil (crude rice bran oil refers to refined rice bran oil, that is, rice bran oil that has not been degummed and decolorized), heat it to 70°C with rapid stirring, and add phosphoric acid with a concentration of 85% for conditioning. 0.2% of the amount of rice bran oil, and stirred for 30 minutes, then add sodium hydroxide with a concentration of 2%-2.5%, the amount of sodium hydroxide is 2%-3% of the amount of crude rice bran oil, flocculate and precipitate, and heat to 75°C -78°C, then add water at a temperature of 90°C-95°C and stir for 15 minutes, the amount of water is 8% of the crude rice bran oil, and centrifuge at a speed of 10000r / min for 10 minutes to obtain a degummed product;
[0024] (2), decolorization
[0025] Under the condition o...
Example Embodiment
[0028] Example 2:
[0029] Under the condition of a vacuum of 0.09MPa, stir and heat 50g of the decolorized product to 220°C, add 1.042g of glycerin, add 0.3% W / W catalyst zinc oxide, catalyze the reaction for 4 hours, and the acid value can be reduced from 38.14mgKOH / g to 5.32mgKOH / g, low acid value rice bran oil was obtained.
[0030] Other steps are the same as in Example 1.
Example Embodiment
[0031] Example 3:
[0032] Under the condition of a vacuum of 0.09MPa, stir and heat 50g of the decolorized product to 200°C, add 1.563g of glycerin, add 0.2% W / W catalyst zinc, and catalyze the reaction for 2 hours, the acid value can be reduced from 38.14mgKOH / g to 6.90 mgKOH / g, low acid value rice bran oil was obtained.
[0033] Other steps are the same as in Example 1.
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Abstract
The invention relates to an esterification deacidification process for high acid number rice bran oil, and the process can well solve the problem of a low refining rate. The esterification deacidification process for high acid number rice bran oil comprises grease pretreatment, namely two steps of degumming and decolorizing. A decolorized substance is obtained after the decolorizing, and then esterification deacidification is carried out. The concrete operating method comprises the following steps of: adding glycerin after the decolorized substance is stirred and heated at a vacuum degree of 0.09 MPa; adding a catalyst of zinc oxide or zinc to carry out a catalytic reaction to generate low acid number rice bran oil with an acid number of 5-7mgKOH/g. The zinc oxide or zinc which is taken as the catalyst of the esterification deacidification of the high acid number bran oil can effectively boost the esterification reaction and rapidly reduce the acid number; simultaneously the process overcomes the problems of the low refining rate lying in a traditional refining method and a great deal of sewage produced by a chemical alkali refining method; the zinc oxide or zinc has a low price, thereby reducing production cost; compared with other chemical esterification catalysts, the zinc oxide or zinc has a very low toxity, thereby being very suitable for the production of edible grease.
Description
technical field [0001] The invention relates to a process for deacidifying oil. Background technique [0002] Rice bran oil is a kind of oil made from rice bran, a by-product of rice processing. It is an ideal edible vegetable oil, the ratio of oleic acid and linoleic acid is roughly 1:1, and it is rich in nutrients, such as vitamin E, oryzanol, sterols, etc. Edible rice bran oil has a good curative effect on lowering human serum cholesterol, preventing arteriosclerosis and hypertension. Therefore, rice bran oil is an oil with high nutritional value and great development potential. [0003] At present, the deacidification process of oil refining mainly adopts chemical alkali refining method and physical refining method, both of which are not suitable for deacidification of rice bran oil with high acid value. The chemical alkali refining method has a large refining loss for high-priced oils. Generally, for oils with an acid value of 20mgKOH / g, the oil loss after alkali ref...
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