Method for preparing metal cyanide catalysts using insoluble...

B - Operations – Transporting – 01 – J

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

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CA 2478830

Metal cyanide catalyst dispersions in initiator compounds and/or polyethers are prepared by reacting an acidic metal cyanide compound with an insoluble metal salt in a medium that is a solvent for the acidic metal cyanide compound but not the metal salt. The resulting catalyst slurry may be combined with an initiator and stripping to form a catalyst/initiator or catalyst/polyether slurry. Using this method, an active alkylene oxide polymerization catalyst is prepared, and the preparation method is greatly simplified. Further, it is not necessary to use a separate organic complexing agent in the preparation.

On prépare des dispersions de catalyseurs au cyanure métallique dans des composés initiateurs et/ou des polyéthers, en faisant réagir un composé au cyanure métallique acide avec un sel métallique insoluble dans un milieu qui constitue un solvant pour le composé au cyanure métallique acide mais non pour le sel métallique. Le catalyseur en suspension épaisse qui en résulte peut être combiné à un initiateur et à un stripping pour former un catalyseur/initiateur ou un catalyseur/polyéther en suspension épaisse. A l'aide de ce procédé, un catalyseur de polymérisation d'oxydes d'alkylène actif peut être préparé et le procédé de préparation est considérablement simplifié. Il n'est pas nécessaire en outre d'utiliser un agent complexant organique séparé dans cette préparation.

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