Double metal cyanide-rare earth compound composite catalyst for CO2-epoxypropane copolymerization

Abstract

The invention provides a double metal cyanide-rare earth compound composite catalyst for CO2-epoxypropane copolymerization. In the catalyst, the mol ratio of the metal Co, Fe, Ni or Cr to La, Pr, Nd, Yb, Lu or Y of rare earth is 1:1-1:16. When the catalyst is used for the CO2-epoxypropane copolymerization, the weight content of cyclic carbonate ester in a reaction mixture is less than 2 percent, the polymer yield in a crude product is improved by more than 30 percent compared with the condition that only the double metal cyanide is used as the catalyst, and the maximum catalysis efficiency can reach 52kg of polymer in 1g of compound DMC (Dimethyl Carbonate). In the copolymer, the content of carbonic ester is more than 35 percent, and the content of Mn is more than 100,000g / mol.

Description

technical field

[0001] The present invention belongs to CO 2 - A double metal cyanide-rare earth complex composite catalyst for the copolymerization of propylene oxide. Background technique

[0002] Carbon dioxide is not only a greenhouse gas, but also an available carbon resource, and has attracted much attention. Since the advent of carbon dioxide-propylene oxide copolymer (Makromol.Chem., 130, 210, 1969), scientists from various countries have successively developed ZnEt 2 - Catalyst systems containing active hydrogen compounds, zinc salt catalysts, large hindrance zinc salt catalysts, rare earth catalyst systems and Al, Cr, Co, Mn, Mg catalyst systems, etc.

[0003] The use of double metal cyanides to catalyze carbon dioxide-epoxide copolymerization originated from the research work of Kuyper et al. In 1985, the Kuyper research group first used Zn 3 [Fe(CN) 6 ] 2 Catalyzes the copolymerization of carbon dioxide and epoxides. The polymerization temperature is 35°C,...

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