Method for separating high-purity rice bran crude oil from rice bran

Abstract

The present invention discloses a method for separating high-purity rice bran crude oil from rice bran. The method comprises: weighing 100 g of puffed rice bran, extracting by using n-hexane as a solvent, sequentially carrying out centrifugation and evaporation to obtain primary pure rice bran crude oil, carrying out film distillation on the primary pure rice bran crude oil raw material at a temperature of 120-130 DEG C under an absolute vacuum of 30-50 Pa to remove water and organic small molecule impurities, carrying out distillation twice to obtain fatty acid, and carrying out distillation twice on the remnants of the two distillations to obtain the high-purity rice bran oil. According to the present invention, the method has characteristics of high physiologically active substance content, low wax content, rice bran oil purity improving, physiologically active substance precipitation reducing during the freezing wax treatment, and complete impurity removing.

Description

technical field [0001] The invention belongs to the technical field of oil plant deep processing, in particular to a method for separating high-purity rice bran crude oil from rice bran. Background technique [0002] Rice bran accounts for about 5% to 5.5% of the weight of rice, and rice germ accounts for about 2.5%. Rice bran crude oil can be extracted from rice bran, a special oil plant, and refined to obtain edible rice bran oil with nutritional and health functions; rice bran oil is a nutritional Rich vegetable oil, high content of unsaturated fatty acids, oleic acid and linoleic acid reached the best ratio of 1:1, and rich in oryzanol, tocopherol and tocotrienol and other natural active ingredients, and the absorption rate after eating More than 90. [0003] Rice bran oil contains about 2% to 5% wax. Bran wax is insoluble in water, ethanol, etc., but it has the property of hot melting and cold analysis for certain solvents such as n-hexane, isopropanol, and No. 6 solve...

AI Technical Summary

Problems solved by technology

[0003] Rice bran oil contains about 2% to 5% wax. Bran wax is insoluble in water, ethanol, etc., but it has the property of hot melting and cold analysis for certain solvents such as n-hexane, isopropanol, and No. 6 solvent, that is, heating When the bran wax is completely dissolved in the oil; but when the temperature is lowered, part or all of it will be precipitated; at present, the solvent leaching method used in industrial production will dissolve most of the waxes and pigments in the oil due to the high temperature. In rice bran oil, the amount of refining reagents and the difficulty of refining are increased, which seriously affects the quality and nutritional value of rice bran oil

[0004] The traditional extraction process of rice bran oil includes degumming, dewaxing, deacidification, decolorization, deodorization and other steps, but each step cannot completely remove the impurities to be removed, so the obtained rice bran oil still contains impurities, and the traditional extraction process of rice bran oil has many steps , also has a certain impact on the composition of rice bran oil; in the traditional process, organic solvents are used to remove impurities, which cannot completely remove impurities, and the ether used is harmful to operators and the environment