process for the preparation of modified clay based heterogeneous catalyst, use of heterogeneous catalyst in biodiesel production process

摘要

process for the preparation of heterogeneous catalyst based on modified clays, use of heterogeneous catalyst in the biodiesel production process. The present invention relates to obtaining heterogeneous catalysts from a process of impregnating inorganic salts on the surface of fresh clays, some of which are applied to the transesterification reaction of an ester in the presence of an alcohol at a given temperature. After the time required for the reaction to take place the solid catalyst is separated from the reaction medium and treated for further reaction. Examples of these catalysts are in-natured smectitic clays, which may have different chemical and mineralogical compositions when subjected to treatment with concentrated solutions of inorganic salts, especially potassium fluoride. developed heterogeneous catalysts promote high conversion rates of higher molecular weight esters to other lower molecular weight esters (transesterification) in the presence of an alcohol and can be used for biodiesel production under milder reaction conditions than state catalysts technique or to promote any other type of transesterification reaction