Patent ID: 6869905

Claim:
A method of synthesizing a double metal cyanide (DMC) catalyst, said method comprising the step of: combining a non-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 a non-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, isothiocyanatcs, carboxylates, and nitrates, and n is a value from 1 to 3 satisfying the valency state of N; and with a non-aqueous solution of an alkali metal cyanide in a single step to synthesize the DMC catalyst.