New technique for separating and extracting fatty acid in nigre of vegetable oil

Abstract

This invention relates to a new technique for separating and purifying fatty acids from soap stock of plant oil. The new technique is aimed to achieving a hydrolysis rate of 98% with mild reaction conditions. The technique comprises: (1) performing short-path distillation on acidified plant oil to separate heavy and light components; (2) performing acid-catalyzed hydrolysis on the heavy components under normal pressure to obtain crude fatty acids; (3) performing short-path distillation to obtain purified fatty acids. The light components are mainly fatty acids, thus can reduce the contents of fatty acids in the acidified plant oil and realize rapid and high-efficiency hydrolysis of grease. The reactions are performed at 120 deg.C under normal pressure, thus can reduce the requirements on the equipment.

Description

technical field

[0001] The invention relates to the field of biochemical technology, in particular to a process for separating and extracting fatty acids in vegetable oil soapstock. Background technique

[0002] Rapeseed is the most important oil crop in my country, with an average annual planting area of ​​110-120 million mu and a total output of about 11 million tons, ranking first in the world. Soapstock is a by-product of rapeseed oil alkali refining and deacidification process, which accounts for about 5% of rapeseed oil production, and the main components in soapstock are: neutral oil, phospholipid, sodium soap and water, in addition Some substances such as protein, carbohydrates and pigments have a total fatty acid content of 40%-60%.

[0003] Fatty acid is an important industrial raw material and the basic raw material of oleochemical industry. It is mainly used in emulsion polymerization and as a rubber additive. It is used to prepare ore flotation agents and oil f...