Preparation method of double metal cyanide catalyst for preparing a polycarbonate-ether

Abstract

The present invention relates to a preparation method of double metal cyanide catalyst for producing a polycarbonate-ether from epoxide and carbon dioxide, wherein said process comprises the following steps: (a) mixing of a metal salt selected from zinc (II) metal salt, iron (II) metal salt, cobalt (II) metal salt, nickel (II) metal salt, metal cyanide salt, and the first complexing agent selected from alcohol compounds, ketone and diketone compounds, ketone-ester compounds, ether compounds, or a mixture thereof at predetermined time and temperature to obtain double metal cyanide catalyst precursor; and (b) subjecting the double metal cyanide catalyst precursor obtained from step (a) to react with the second complexing agent selected from aliphatic carbonyl compound, aliphatic ester ether compound, or a mixture thereof in water or organic solvent at a predetermined time and temperature to obtain the double metal cyanide catalyst.

Dependencies are inferred from the claim text.