METHOD OF PREPARING DOUBLE METAL CYANIDE CATALYSTS Russian patent published in 2006 - IPC B01J27/26 B01J37/04 C08G65/10 

FIELD: organic synthesis catalysts.

SUBSTANCE: invention relates to improved method for preparing double metal cyanide catalysts effective to catalyze synthesis of polyetherpolyols via polyaddition of alkylene oxides to starting compounds containing active hydrogen atoms. Method is characterized by that aqueous solutions of metal salt and metal cyanide salt are first brought to react in presence of organic complex ligands and, if necessary, one or several other complexing components to form dispersion of double metal cyanide catalyst, which is filtered to give filtration precipitates. The latter are washed with one or several aqueous or nonaqueous solution of organic complex ligands in flowing washing mode and, if necessary, one or several other complexing components, after which washed filtration precipitates are dried after optional squeezing and mechanical removal of moisture. Washing and drying stages are performed on the same filter.

EFFECT: significantly simplified process due to avoided repetitive redispersing of catalyst followed by transferring filtration precipitate to another equipment.

9 cl, 13 ex