METHOD FOR PURIFYING POLYETHER POLYOLS MADE WITH DOUBLE METAL CYANIDE CATALYSTS

A method for purifying polyether polyols made with double metal cyanide (DMC) catalysts is disclosed. A poly(oxypropylene) polyol containing DMC catalyst residues is combined with an amount of an alkali metal compound sufficient to convert DMC residues to an insoluble species, but not sufficient to...

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Bibliographische Detailangaben
1. Verfasser:	RUSZKAY, JUDE T
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A method for purifying polyether polyols made with double metal cyanide (DMC) catalysts is disclosed. A poly(oxypropylene) polyol containing DMC catalyst residues is combined with an amount of an alkali metal compound sufficient to convert DMC residues to an insoluble species, but not sufficient to generate polyol alkoxide groups. The polyol is heated in the presence of water, and is then filtered and stripped. The method eliminates the need to use magnesium silicate in removing DMC catalysts from polyols.