PROCESS FOR PREPARING HIGHLY ACTIVE DOUBLE METAL CYANIDE CATALYSTS AND THEIR USE IN THE SYNTHESIS OF POLYETHER POLYOLS

摘要

The present invention relates to a process of preparing a double metal cyanide (DMC) complex catalyst with an improved catalytic activity useful for epoxide polymerization. It also relates to the DMC catalyst obtainable by said process, as well as to polyether polyols prepared by a polymerization reaction using said DMC catalyst.

主权项

1. A process of preparing a double metal cyanide complex catalyst, said process comprising:
a) synthesizing a solid double metal cyanide catalyst in the presence of an organic complexing agent and a polyether polyol ligand; and b) first washing the catalyst obtained in step a) with an aqueous solution comprising:
90-100% by weight of water; and0-10% by weight of a polyether polyol, to form a slurry, wherein the aqueous solution does not contain any organic complexing agent.