Process for the preparation of dmc catalysts

B - Operations – Transporting – 01 – J

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

Patent

CA 2406526

The invention relates to an improved method for producing double metal cyanide (DMC) catalysts for producing polyether polyols by the polyaddition of alkylene oxides to starter compounds comprising active hydrogen atoms. According to the inventive method, aqueous solutions of a metallic salt and of a metal cyanide salt are firstly reacted in the presence of an organic complex ligand and optionally in the presence of one or more additional complex- forming constituents while forming a DMC catalyst dispersion. This dispersion is then filtered and the filter cake is subsequently washed by filter cake washing involving the use of one or more aqueous or non-aqueous solutions of the organic complex ligand and optionally the use of one or more additional complex-forming constituents. The washed filter cake is then dried after an optional press drying or mechanical desiccation in the membrane filter press.

La présente invention concerne un procédé amélioré de production de catalyseurs à base de cyanure métallique double (DMC), en vue de produire des polyols de polyéther, par polyaddition d'oxydes d'alkylène à des composés amorces présentant des atomes d'hydrogène actif. Selon ce procédé, des solutions aqueuses d'un sel métallique et d'un sel de cyanure métallique sont d'abord mises en réaction, en présence d'un ligand complexe organique et éventuellement d'un ou plusieurs autres composants complexants, formant une dispersion de catalyseurs DMC, puis cette dispersion est filtrée et le gâteau de filtration est ensuite lavé par lavage de gâteau de filtration, avec une ou plusieurs solutions aqueuses ou non aqueuses du ligand complexe organique et éventuellement un ou plusieurs autres composants complexants. Le gâteau de filtration lavé est finalement séché, après une éventuelle compression ou déshydratation mécanique dans la presse à membrane filtrante.

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