process for producing glyceride biodiesel and process for producing purified glyceride biodiesel

摘要

PROCESS FOR PRODUCING GLYCERID BIODIESEL AND PROCESS FOR PRODUCING PURIFIED GLYCERID BIODIESEL. A system and method for converting free fatty acids to glycerides and the subsequent conversion of glycerides to glycerine and biodiesel includes transesterification of a glyceride stream with an alcohol. The fatty acid alkyl esters are separated from glycerine to produce a first liquid phase containing a (concentrated fatty acid alkyl ester rich stream and a second liquid phase containing a (concentrated) glycerine rich stream. The fatty acid alkyl ester is then subjected to distillation, preferably reactive distillation, whereby the stream undergoes both physical separation and chemical reaction.The fatty acid alkyl ester rich stream is then purified to produce a biodiesel product. Biodiesel can be further recovered from the glyceride rich residual stream by further separation and / or processing of glycerides / free fatty acids contained therein. be purified to produce a purified glycerin product and a second (second) stream of alcohol. Neutralization of the alkaline stream formed during the acid-catalyzed transesterification process may proceed by the addition of a mineral or an organic acid.