Refining process of glyceride type fish oil

Abstract

The invention relates to a refining process of glyceride type fish oil. The refining process includes the steps of S1, delivering gross fish oil measured by a metering pump to an alkali refining tankthrough a feed pipe, and subjecting the gross fish oil to heating and circulating stirring; S2, preparing, by weight, 4-6% of weak caustic liquor for primary alkali refining; S3, after completion of reaction, spreading solid salt used for preventing emulsification or adding dilute salt water with the same temperature as the fish oil in the alkali refining tank, allowing the alkali refining tank tostand for 1-2 hours for insulation precipitation, and discharging a stratified soapstock layer to a molecular distillation unit; S4, preparing, by weight, 14-16% of dense alkali for secondary alkalirefining; S5, after completion of reaction, spreading the solid salt or adding the dilute salt water with the same temperature as the fish oil to allow the alkali refining tank to stand for 2-3 hoursfor insulation precipitation once again, and discharging the stratified soapstock layer to the molecular distillation unit once more; S6, subjected the fish oil via the secondary alkali refining to washing ,dewatering, winterization filtering and decoloring to finally prepare the glyceride type fish oil stored in a finished product tank.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a glyceride-type fish oil refining process. Background technique [0002] Fish oil is the general term for all oils in fish, including body oil, liver oil, and brain oil. The main fish oil is a kind of oil extracted from fatty fish, which contains a large amount of unsaturated fatty acids (especially the unique EPA in fish oil) and DHA content as high as 18%-33%), which has health benefits such as anti-inflammatory and blood lipid regulation. Crude fish oil is also called hairy fish oil, because it contains a certain amount of impurities such as water, impurities, colloid, fish body protein and free fatty acids, its acid value is high, its color is deep, and it is accompanied by a strong fishy smell , so it needs to be refined and reach a certain quality index before it can be used. The commonly used fish oil refining process is: crude fish oil-filtration-deg...

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN101818176A discloses a method for converting fatty acid ethyl esters into glycerides, wherein fatty acid ethyl ester type oil plants and glycerin are used as raw materials, and lipase is used as a catalyst for transesterification, but the enzymatic transesterification reaction The purpose fatty acid in will be diluted, it is difficult to obtain the product of high content, and conversion rate is different at the same time; Publication No. is CN102277237A Chinese patent discloses a kind of preparation method of high-purity glyceride type fish oil, and this method adopts zinc powder to catalyze esterification legal system Glyceride-type fish oil is different from the existing enzyme-catalyzed method, and can avoid the shortcomings of the enzyme-catalyzed method. The esterification reaction is only 1.5-3 hours, the production cycle is short, and the production cost is greatly reduced. It is suitable for industrial production

In summary, the method of using ethyl ester fish oil as raw material and converting it into glyceride fish oil through transesterification has a low conversion rate, and a large amount of ethyl ester fish oil is used simultaneously, and the cost of raw materials is high, resulting in the production of ethyl ester fish oil. The waste of type fish oil raw material, equipment investment is big, therefore, the method for this transesterification preparation glyceride type fish oil is also difficult to realize large-scale production

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