A CONTINUOUS TRANSESTERIFICATION METHOD FOR PREPARING POLYOL POLYESTERS

摘要

A continuous transesterification method for preparing polyol polyesters is disclosed. The transesterification reaction of alkyl fatty acid esters and polyols to make polyol polyesters can be coupled with a process to make a lower alkyl, esters of fatty acids. An inert gas is used to remove the alcohols. The gaseous alcohols derived from the transesterification reaction are used as the source of alcohol in the lower alkyl esters synthesis and the inert gas from the alcohol stream can be recycled. The process comprises preparing fatty acid methyl esters, recovering the methyl esters and then transesterifying a polyol in a solvent-free two stage process with the fatty acid methyl esters.