Method for producing polyether carbonate polyols

A process for preparing a polyether carbonate polyol consisting of reacting one or more H-functional starter substances, one or more alkylene oxides, and carbon dioxide in the presence of at least one double metal cyanide catalyst prepared from a cyanide-free metal salt and a potassium hexacyanocobaltate(III) salt, wherein said cyanide-free metal salt and/or said potassium hexacyanocobaltate(III) salt comprises from 0.3 to 1.8 mol base equivalents, based on 1 mol of said metal cyanide salt, of an alkaline metal hydroxide, metal carbonate, and/or metal oxide, wherein said at least one double metal cyanide catalyst is prepared by reacting an aqueous solution of said cyanide-free metal salt with an aqueous solution of said potassium hexacyanocobaltate(III) salt in the presence of one or more organic complex ligands, wherein said aqueous solution of said cyanide-free metal salt and/or said aqueous solution of said potassium hexacyanocobaltate(III) salt comprises one or more alkaline metal hydroxides, metal carbonates, and/or metal oxides, and wherein the total amount of said one or more alkaline metal hydroxides, metal carbonates, and/or metal oxides used is in the range of from 0.3 to 1.8 mol base equivalents, based on 1 mol of the potassium hexacyanocobaltate(III) salt.