Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Carlson Torren

Christoph Gürtler

Jörg Hofmann

Thomas Ernst Müller

Matthias Wohak

Thomas Ernst MÜLLER

The invention relates to a method for producing polyether carbonate polyols, comprising the step of reacting alkylene oxide with carbon dioxide in the presence of an h-functional starter compound and double metal cyanide catalyst. The invention is characterized in that the method comprises the following steps: (&#x3b1;) optionally, pre-treating the double metal cyanide catalyst (DMC catalyst) at a temperature of 50 to 200&#xb0; C. and/or reduced pressure (absolute) of 10 mbar to 800 mbar; (&#x3b2;) bringing the double metal cyanide catalyst in contact with suspension means, and furthermore, with alkylene oxide in the first reactor thus obtaining a first reaction mixture, and (&#x3b3;) continuous added dosing of the first reaction mixture, alkaline oxide, and carbon oxide, and optionally, h-functional starter compound in a second reactor, wherein in at least one of the steps (&#x3b2;) or (&#x3b3;), at least one h-functional starter compound is used, and wherein reaction products formed in step (&#x3b3;) are continuously removed from the second reactor.

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Newark, DE, United States of America

Carlson Torren