Method for producing diesel oil by esterification deacidification of rice bran oil

Abstract

The invention relates to a rice bran oil, specifically to a method for producing diesel oil by esterification deacidification of the rice bran oil, and belongs to the technical field of chemical industry. By the adoption of zinc oxide as a catalyst, the rice bran crude oil with high acid value undergoes esterification deacidification and is deacidified into a biodiesel material. The acid value of the rice bran oil can be decreased from 38.14mg / g to 5.17mg / g. Free fatty acid in the rice bran oil can react with glycerin at high temperature under vacuum in the presence of a catalyst to generate triacylglycerol, diacylglyeerol and monoglyceride. According to the chemical principle to design a chemical catalysis method, a lot of free fatty acid in the rice bran crude oil undergoes resterification to generate neutral oil. And simultaneously, the purpose of deacidification is achieved and the pollution of soap stock to the environment is eliminated. Additional loss is greatly reduced. And in the meanwhile, inevitable loss caused by free fatty acid which must be removed during the above chemical alkali refining and physical deacidification refining processes is changed into neutral rice bran grease, so as to raise the refining yield of the grease.

Description

technical field [0001] The invention relates to rice bran oil, in particular to a method for producing diesel oil through esterification and deacidification of rice bran oil, which belongs to the technical field of chemical industry. Background technique [0002] Rice bran oil is a kind of oil produced by processing rice bran, a by-product of rice processing. It is a large and wide renewable resource. However, for a long time, most areas have used rice bran as feed for livestock and poultry. It has nutritional value and resource The benefits have not been brought into full play, and less than 15% are used for rice bran oil processing, resulting in a great waste of this superior resource of rice bran. On the other hand, because a large number of small-scale oil and fat production enterprises have not carried out esterase passivation treatment on rice bran, the raw material for rice bran oil production, and the storage time of rice bran is too long or the storage temperature i...

AI Technical Summary

Problems solved by technology

The traditional deacidification and refining methods, chemical refining and physical refining, are not suitable for the refining of rice bran oil with high acid value, and the refining rate is low. Alkali refining and deacidification will also produce a large amount of organic waste water, polluting the environment, and using industrial monoglycerin Esters and lipases have been studied on the enzymatic esterification and deacidification of rice bran oil with high acid value, which can effectively reduce the content of free fatty acids in the oil, but the price of the enzyme is high and it is not suitable for industrial production