Process for making double metal cyanide catalysts

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B01J 27/26 (2006.01) C08G 59/68 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2282640

A process for making substantially non-crystalline double metal cyanide (DMC) catalysts having improved activity and performance is disclosed. The process comprises using a metal salt having an alkalinity within the range of about 0.2 to about 2.0 wt.% as metal oxide based on the amount of metal salt to prepare the catalyst. Surprisingly, important polyol properties such as viscosity and unsaturation improve when the alkalinity of the metal salt used to make the DMC catalysts is properly controlled. The process allows catalyst producers to enjoy the benefits of substantially non-crystalline DMC catalysts even when relatively inexpensive, technical-grade metal salts are used to make the catalyst.

Ce procédé permet de fabriquer des catalyseurs à base de cyanure métallique double (DMC) sensiblement non-cristallins présentant une activité et des performances améliorées. Le procédé est caractérisé par l'utilisation d'un sel métallique, en tant qu'oxyde métallique, dont l'alcalinité est comprise entre environ 0,2 et environ 2,0 % en poids sur la base de la quantité de sel métallique pour préparer le catalyseur. On a constaté que des caractéristiques importantes du polyol, telles que la viscosité et l'insaturation s'améliorent lorsque l'alcalinité du sel métallique utilisé pour fabriquer le catalyseur DMC est correctement régulée. Le procédé permet aux producteurs de catalyseurs de disposer de catalyseurs DMC sensiblement non cristallins, même lorsque les catalyseurs sont fabriqués avec des sels métalliques de qualité industrielle relativement bon marché.

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