MODIFIED DOUBLE METAL CYANIDE CATALYSTS, PROCESS FOR THE PREPARATION BY TREATMENT OF CRYSTALLINE DMC CATALYST WITH BRONSTED ACID AND USE THEREOF

摘要

The invention relates to a method for the preparation of double metal cyanide (DMC) catalysts which are used in the production of polyether polyols and the DMC catalysts obtained. The DMC catalysts show enhanced performance in alkoxylation reactions, so that lower concentrations of the DMC catalyst can be used in polyether polyol production.