Process for preparing fatty acid alkyl esters

Details Process for preparing fatty acid alkyl esters Process for preparing fatty acid alkyl esters

C - Chemistry, Metallurgy

11

C

C11C 3/04 (2006.01) C07C 67/02 (2006.01) C07C 67/03 (2006.01) C07C 69/58 (2006.01) C07C 69/732 (2006.01) C11C 3/00 (2006.01)

Patent

CA 2164931

A method for the preparation of fatty acid alkyl esters by transesterification, in particular catalytic transesterification, of triglycerides, wherein from a reaction mixture, in which the transesterification is carried out, an ester phase and a glycerol phase containing fatty acids, fatty acid salts and/or other fatty acid compounds are formed, which are separated from each other, characterized in that the fatty acids, the fatty acid salts and/or other fatty acid compounds are separated from the glycerol phase, esterified with an alcohol and recycled to a different reaction mixture, in which a further transesterification is carried out. The method according to the invention allows for a transesterification with a high yield of fatty acid esters.

L'invention concerne un procédé de fabrication d'esters d'alkyle d'acide gras, notamment par transestérification catalytique de triglycérides. A partir d'un mélange réactionnel dans lequel s'est opéré la transestérification, une phase ester et une phase glycérique contenant des acides gras, des sels d'acide gras et/ou d'autres composés d'acide gras sont constituées puis séparées l'une de l'autre. Ce procédé se caractérise en ce que les acides gras, les sels d'acide gras et/ou d'autres composés d'acide gras sont séparés de la phase glycérique, sont estérifiés et sont renvoyés dans un autre mélange réactionnel dans lequel est effectuée une autre transestérification. Ce procédé permet de réaliser une transestérification conduisant à des rendements élevés d'esters d'acide gras.

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