Dmc complex catalyst and process for its preparation

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B01J 27/26 (2006.01) C08G 65/10 (2006.01) C08G 65/26 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2404652

Process for the preparation of a DMC catalyst useful in the polymerization of alkylene oxides into polyether polyols, which process comprises the steps of (a) combining an aqueous solution of a metal salt with an aqueous solution of a metal cyanide salt and reacting these solutions, wherein at least part of this reaction takes place in the presence of an organic complexing agent, thereby forming a dispersion of a solid DMC complex in an aqueous medium; (b) combining the dispersion obtained in step (a) with a liquid, which is essentially insoluble in water and which is capable of extracting the solid DMC complex formed in step (a) from the aqueous medium, and allowing a two- phase system to be formed consisting of a first aqueous layer and a layer containing the DMC complex and the liquid added; (c) removing the first aqueous layer; and (d) recovering the DMC catalyst from the layer containing the DMC catalyst.

L'invention concerne un procédé de préparation d'un catalyseur au cyanure métallique double (DMC) utile dans la polymérisation d'oxydes d'alcoylène en polyéther-polyols. Ledit procédé consiste à (a) combiner une solution aqueuse d'un sel métallique avec une solution aqueuse d'un sel de cyanure métallique et à faire réagir ces solutions, au moins une partie de cette réaction ayant lieu en présence d'un agent complexant organique, une dispersion d'un complexe solide au DMC dans un milieu aqueux étant ainsi formée ; (b) à combiner la dispersion obtenue à l'étape (a) avec un liquide, essentiellement insoluble dans l'eau et capable d'extraire du milieu aqueux ledit complexe solide au DMC formé à l'étape (a) et à former un système à deux phases consistant en une première couche aqueuse et en une couche contenant le complexe au DMC et le liquide ajouté ; (c) à enlever la première couche aqueuse ; et (d) à récupérer le catalyseur au DMC dans la couche contenant ledit catalyseur au DMC.

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