abstract |
Improved methods for synthesizing double metal cyanide (DMC) catalysts are disclosed. These methods combine an aqueous solution of a first metal salt, such as ZnCl 2 , with an aqueous solution of a second metal salt, such as CoCl 2 , and with an aqueous solution of an alkali metal cyanide, such as KCN, in different manners to synthesize DMC catalysts, such as Zn 3 [Co(CN) 6 ] 2 . |