Patent ID: 10138328

Abstract:
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: (α) optionally, pre-treating the double metal cyanide catalyst (DMC catalyst) at a temperature of 50 to 200° C. and/or reduced pressure (absolute) of 10 mbar to 800 mbar; (β) 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 (γ) 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 (β) or (γ), at least one h-functional starter compound is used, and wherein reaction products formed in step (γ) are continuously removed from the second reactor.