DMC COMPLEX-BASED CATALYST AND A METHOD FOR PREPARATION THEREOF Russian patent published in 2005 - IPC

FIELD: polymerization catalysts.

SUBSTANCE: invention disclose a method for preparing catalyst based on DMC (4,4'-dichloro-α-methylbenzhydrol) appropriate to be used in polymerization of alkylene oxides into polyol-polyethers comprising following stages: (i) combining aqueous solution of metal salt with metal cyanide aqueous solution and allowing these solutions to interact, while at least one part of this reaction proceeds in presence of organic complexing agent to form dispersion of solid DMC-based complex in aqueous medium; (ii) combining dispersion obtained in stage (i) with essentially water-insoluble liquid capable of extracting solid DMC-based complex and thereby forming biphasic system consisting of first aqueous layer and a layer containing DMC-based complex and liquid added; (iii) removing first aqueous layer; and (iv) removing DMC-based complex from layer containing DMC-based catalyst.

EFFECT: lack of negative effect on DMC-based catalyst activity.

16 cl, 1 tbl, 3 ex