Patent ID: 8378132
Filing Date: 2013-02-19
Classification: C11C,Y02E

Abstract:
1. A method for producing biodiesel-quality esters, comprising: introducing a first charge into a reactor, the first charge including a triglyceride-containing first fat, a first alcohol, and a first base, wherein the first fat has an acid value over 2; performing a first transesterification reaction in which the first fat reacts with the first alcohol to produce a first reaction product that comprises an alkyl ester and glycerol; contacting the first reaction product with a triglyceride-containing second fat, wherein the second fat has an acid value of less than 2, to yield an intermediate product; separating the intermediate product into a first alkyl ester-rich fraction and a first glycerol-rich fraction; contacting the alkyl ester-rich fraction with a second alcohol and a second base and performing a second transesterification reaction that produces a second reaction product that comprises glycerol and an alkyl ester; and separating the second reaction product into a second alkyl ester-rich fraction and a second glycerol-rich fraction.