Verfahren zur Herstellung von Fettsäureestern

摘要

The invention concerns a method for preparing fatty acid esters from fatty acid triglyceride and specially from animal and vegetable fats and oils by transesterification with a lower monohydric alcohol in the presence of a homogenous or heterogeneous catalyzer. According to the invention, the fatty acid ester formed is extracted from the reaction mixture with an extracting agent close to critical point. Thus a greater yield of fatty acid esters and excellent purity are obtained. Preferably a low-pressure gas with a reduced temperature at 20 DEG C of approximately 0.7, preferably greater than or equivalent to 0.7 should be used as extracting agent. The preferred extracting agents are carbon dioxide, propane, butane, dimethyl ether, ethyl acetate or their mixtures.