Patent ID: 6436867
Filing Date: 2002-08-20
Classification: B01J,C08G

Abstract:
A method of synthesizing a double metal cyanide (DMC) catalyst, said method comprising the steps of:combining an aqueous solution of a first metal salt of the general formula M(X)n wherein; M is selected from the group consisting of aluminum, zinc, and the transition metals, X is an anion selected from the group consisting of halides, hydroxides, sulfates, carbonates, cyanides, oxalates, thiocyanates, isocyanates, isothiocyanates, carboxylates, and nitrates, and n is a value from 1 to 3 satisfying the valency state of M; with an aqueous solution of a second metal salt of the general formula N(Y)n wherein; N is selected from the group consisting of the transition metals and the lanthanides, Y is an anion selected from the group consisting of halides, hydroxides, sulfates, carbonates, cyanides, oxalates, thiocyanates, isocyanates, isothiocyanates, carboxylates, and nitrates, and n is a value from 1 to 3 satisfying the valency state of N; and with an aqueous solution of an alkali metal cyanide in a single step to synthesize the DMC catalyst; filtering the combination product of the aqueous solutions of the first metal salt, the second metal salt, and the alkali metal cyanide to collect a residual product; and triturating the residual product with a water-soluble organic activator comprising ethanol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, and isobutyl alcohol.