The method of one kind of high acid value of rice bran oil producing diglycerides

The invention discloses a method for producing diglyceride with rice bran oil of high acid value. The method adopts rice bran oil of high acid value as the substrate material and glycerin as the acyl acceptor, and employs lipase for the glycerolysis of rice bran oil of high acid value through enzymatic reaction and the synthesis of diglyceride through esterification in a non-solvent system. The method comprises the steps of: (1) subjecting crude rice bran oil of high acid value to a hydrated degumming process so as to obtain degummed rice bran oil of high acid value; (2) adding glycerin into the degummed rice bran oil of high acid value, thus obtaining a mixture of diglyceride; (3) separating the mixture of diglyceride, thus obtaining diglyceride. In the invention, the preparation processis shortened, the unit operation process of separating the solvent from the system is nonexistent, and the energy consumption is saved. The method of the invention makes fully use of the free fatty acid in the system to reduce the acid value of the system, and the loss of nutrient components from the rice bran oil of high acid value under an enzymatic mild reaction condition is reduced.