Refining method of rice bran oil

Abstract

The invention relates to a refining method of rice bran oil, which adopts crude rice bran oil as raw oil. The rice bran oil is obtained through the procedures such as degumming, oil-foot separation, dewaxing, decoloration, high-temperature deacidification and deodorization, freezing and degreasing. The weaknesses of the traditional refining method that during the degumming, the neutral oil loss is large, partial neutral oil is neutralized by NaOH during the deacidification process and free-fatty acid process yield of the oil grease is reduced are overcame. A combination-type deacidification is adopted during the high-temperature deacidification process, and the acid value can be reduced to 3 through one-time physical deacidification. The utilization rate of the raw material and the product yield are improved, and the environmental pollution caused by the chemical refining can be greatly reduced. The deacidification process is free from the chemical reaction, so the loss of the oil grease is reduced, and the refining rate of the oil grease is improved. The consumption of the auxiliary raw materials and the labor can be reduced, and the price of the distilled fatty acid is better than that of the acidification oil; therefore, not only the production cost is reduced, but also the economic benefit is improved.

Description

technical field [0001] The invention belongs to edible oil refining technology, in particular to a refining method of rice bran oil. Background technique [0002] Rice bran not only has a high content of essential fatty acids and proteins, but also contains other anti-cancer and health-promoting functional substances, such as dietary fiber, vitamins, oryzanol, minerals, etc. It is a high additional resource with great development potential. [0003] Refined rice bran oil is extracted from crude rice bran oil, but crude rice bran oil contains heat-sensitive substances such as free fatty acids, phospholipids, pigments, residual phenols, oryzanol, waxes, and lipolytic enzymes. The existence of these substances greatly increases the difficulty of refining rice bran oil and neutral oil loss. In particular, the presence of lipolytic enzymes makes the acid value of crude rice bran oil very high, and the acid value of crude rice bran oil after long-term storage can even reach 30mg / ...

AI Technical Summary

Problems solved by technology

However, while neutralizing free fatty acids, some neutral oils are also neutralized by NaOH, which reduces the yield of oil

However, when comprehensively utilizing soapstock, it is necessary to add 98% concentrated sulfuric acid to reduce it into fatty acid (commonly known as acidified oil), so the production cost is increased.

In addition, existing technologies cannot process high-acid oils