Process for the preparation of alkyl esters of carboxylic acids, in particular of alkyl esters of fatty acids, and their use as diesel motor fuel

摘要

1. A process for the preparation of a C6-24 -carboxylic acid alky ester, in particular a fatty acid alkyl ester, and glycerol and/or an ether of glycerol with a C1-4 -alcohol through the heterogeneously catalyzed reaction of a triglyceride, a partial glyceride and/or the corresponding carboxylic acid with an excess of an alkanol having 1 to 4 C atoms in a reaction tube at elevated temperature and elevated pressure, characterized in that a catalyst is employed which contains aluminium oxide and/or iron oxide and the reaction is carried out in cocurrent or crosscurrent using a pressure of at least 63 bar.