Process for extracting high-grade rice bran oil by physical method

Abstract

The invention relates to a process for extracting high-grade rice bran oil by a physical method, which utilizes the partial pressure of water vapor to reduce the partial pressure of free fatty acids in the oil and also reduce the boiling point temperature of the free fatty acids under high vacuum conditions, so that the free fatty acids can also be gasified at a lower temperature (240 DEG C) lower and further be separated from the oil. The chemical refining aims to further reduce the acid value, and ensure the oil color; while the process adopts the three-time bleaching and deodorization combining method to achieve the purpose. The three-time bleaching is that a mixing bleaching agent is used to remove 'blue' and other pigments produced in the deacidification process, and the deodorization is that the water vapor distillation principle is utilized to further remove the free fatty acids in the oil, so that the acid value and the like meet the requirements of product quality standards. Compared with the existing refining process, the process has high yield increasing by about 2-3% under the same conditions, and large micronutrient retention capacity, greatly retains nutrients, and significantly reduces the discharge amount of sewage.

Description

【Technical field】

[0001] The invention relates to a process for refining first-grade rice bran oil by physical means. 【Background technique】

[0002] Rice bran oil production technology is a technical problem at home and abroad, and most of the existing technologies are methods combining physics and chemistry. That is, after pretreatment of rice bran crude oil, hydration degumming, dewaxing, primary decolorization, physical deacidification, chemical refining, secondary decolorization, deodorization and degreasing. Although the first-grade rice bran oil can be produced with the existing technology, the product yield is low and the production cost is high; and in the chemical refining process, many micronutrients such as vitamin E, oryzanol, and phytosterols in the oil are lost in large quantities. 【Content of invention】

[0003] Aiming at these deficiencies, the present invention abandons the chemical refining process, and provides a process for refining first-grade rice b...