Process for preparing double metal cyanide catalyst and catalyst prepared in such a manner

摘要

In the present invention, there is disclosed a process for preparing substantially non-crystalline double metal cyanide (DMC) catalysts having improved activity and performance. The process comprises reacting aqueous solutions of a metal salt and a metal cyanide salt in the presence of an organic complexing agent in a manner effective to produce a substantially non-crystalline double metal cyanide (DMC) catalyst, wherein the metal salt has an alkalinity within the range of about 0.2 to about 2.0 percent by weight as metal oxide based on the amount of metal salt. The metal salt can be represented by zinc chloride, the DMC catalyst by a zinc hexacyanocobaltate and the organic complexing agent by tert-butyl alcohol.