Decoloration method for producing edible vegetable oil with low content of trans fatty acid at CO2 supercritical state

Abstract

The invention relates to a decoloration method for producing edible vegetable oil with low content of trans fatty acid at a supercritical CO2 state. The decoloration method of the invention controls the decoloration pressure of the supercritical CO2, the temperature, the carclazyte adding amount, the time and the stirring speed, takes the content of the trans fatty acid as an indicator, and regulates and controls each main parameter to obtain the edible vegetable oil with low content of trans fatty acid finally. In the method of the invention, the decolored carclazyte is utilized to decolor the oil at a supercritical liquid CO2 state; as the active decolored carclazyte has stronger Van der Waals' force at the supercritical liquid CO2 state, the triglyceride polarity is extremely small, and the pigment is larger relative to the polarity, the decolored carclazyt has stronger acting force on the pigment matters in the oil; and at the supercritical liquid state, the liquidity of the pigment is better, reactions, such as oxidation and addition reaction and the like are not easy to occur the oil; and the trans fatty acid content is low.

Description

Technical field: [0001] The invention relates to a decolorization method for producing edible vegetable oil with low trans fatty acid content. Background technique: [0002] During the refining and decolorization process of vegetable oils, unsaturated fatty acids such as oleic acid, linoleic acid, and linolenic acid form certain trans hydroperoxides to varying degrees, and trans fatty acids are produced in the further reaction of hydroperoxides. In addition to hydroperoxide conversion, the presence of free radicals during decolorization catalyzes the formation of trans fatty acids from unsaturated double bonds, and trans isomerization of fatty acids occurs in the presence of acidic catalysts. The adsorption clay for vegetable oil decolorization has the property of solid acid, and the decolorization process directly affects the content of trans fatty acids in vegetable oil. At present, the existing decolorization process does not consider the trans isomerization of fatty aci...

AI Technical Summary

Problems solved by technology

However, the active sites on the surface of the clay adsorbent not only have adsorption properties, but also have acid catalytic properties. If fully activated, the acid catalytic properties will be greatly enhanced, which will easily lead to the formation of trans fatty acids during the decolorization process.