Process for removing and regenerating a double metal cyanide...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 65/00 (2006.01) C08G 65/26 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2515386

A method of removing and reclaiming a double metal cyanide (DMC) catalyst from a polyol is disclosed. A polymeric acid that is soluble in the polyol is introduced into the polyol during or after the polymerization reaction. The polymeric acid reacts with the double metal cyanide catalyst thereby causing the double metal cyanide catalyst and the polymeric acid to form an agglomeration in the polyol. The agglomeration is easily separated from the polyol via filtration, for example. The recovered agglomerated DMC catalyst can then be reconstituted using an acid solution.

L'invention concerne un procédé destiné à extraire et régénérer un catalyseur de cyanure métallique double (DMC) à partir d'un polyol. Un acide polymérique soluble dans le polyol est introduit dans le polyol pendant ou après la réaction de polymérisation. L'acide polymérique réagit avec le catalyseur de cyanure métallique double, ce qui amène le catalyseur de cyanure métallique double et l'acide polymérique à former un agglomérat dans le polyol. Cet agglomérat est facilement séparé du polyol par filtration, par exemple. Le catalyseur DMC de l'agglomérat récupéré peut ensuite être reconstitué au moyen d'une solution acide.

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