Recovery of double metal cyanide complex catalyst from a polymer

Details Recovery of double metal cyanide complex catalyst from a polymer Recovery of double metal cyanide complex catalyst from a polymer

1989-02-27

1991-04-23

Konopka, Paul E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

502 31, 568618, 568620, 568621, B01J 2732, B01J 3868, C07C 4103, C07C 4311

Patent

active

050100475

ABSTRACT:
A process for recovering double metal cyanide complex catalyst from a polymer such as polypropylene glycol in a form suitable for use as a polymerization catalyst is described. The process comprises the steps of (a) combining the polymer with a non-polar solvent to precipitate the catalyst and (b) filtering the resulting mixture in the presence of a filter aid to separate the polymer from the precipitated catalyst. In contrast to the prior art methods of catalyst removal, the process of the invention yields polymer uniformly low in color as well as recovered catalyst which may be reused in subsequent polymerizations.

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patent: 4721818 (1988-01-01), Harper et al.
patent: 4843054 (1989-07-01), Harper
Preparation of High Molecular Weight Polyols Using Double Metal Cyanide Catalysts (Schuchardt, Harper, SPI, Oct. 1989).

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