Method for preparing cyclic carbonate through catalysis of sulfonated metal Salen and polyether ionic liquid binary system

Abstract

The invention relates to a method for preparing cyclic carbonate by catalyzing cycloaddition of CO2 and epoxide through a sulfonated metal Salen and polyether ionic liquid binary system. In order to overcome the defects that a metal complex catalyst is difficult to recycle and the catalytic activity of an organic catalyst is relatively low, the metal complex catalyst and the organic catalyst are combined to create a binary catalytic system of sulfonated metal Salen and polyether ionic liquid, so efficient concerted catalysis of the sulfonated metal Salen and the polyether ionic liquid is realized; the binary catalyst has the advantages of simple construction, high catalytic activity and selectivity, easy separation and circulation, long service life and low loss, and meets the process requirements of green synthesis.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a binary system of sulfonated metal Salen and polyether ionic liquid to catalyze CO 2 A method for the preparation of cyclic carbonates by cycloaddition with epoxides. Background technique [0002] carbon dioxide (CO 2 ) is the main greenhouse gas that causes global warming, and it is also an inexhaustible, cheap, non-toxic, recyclable green C 1 resource. Realize CO 2 resource utilization of CO 2 It is of great strategic significance to reduce emissions, improve the environment and reduce human dependence on fossil fuels. In recent years, cyclic carbonates have been widely used as high value-added chemicals in fine chemicals, lithium battery manufacturing, polycarbonate and polyurethane synthesis and other fields. And by CO 2 Cycloaddition of epoxides to prepare cyclic carbonates is a green chemical approach with 100% atom economy as an alternative to the toxi...

AI Technical Summary

Problems solved by technology

However, the above-mentioned catalysts with the characteristics of "organo-metal hybrid" usually have the disadvantage of lengthy and complicated synthetic routes; another method is to combine metal complex catalysts with organic catalysts to form a binary catalytic system. For example, Darensbourg et al. reported that Cr -Salen / quaternary ammonium salt and Al-Salen / quaternary ammonium salt binary catalyst (Inorg.Chem.2004,43,1831-1833; Inorg.Chem.2005,44,1433-1442); Lu and Berkessel et al reported Co -Salen / quaternary ammonium salt binary catalyst for asymmetric cycloaddition reaction (J.Am.Chem.Soc.2004,126,3732-3733; Org.Lett.2006,8,4401-4404.); Ren et al Al-Salen / TBAB binary catalytic system was reported (RSC Adv., 2018, 8, 39182–39186.), etc.

However, the limitation of binary catalytic systems is that metal complexes or quaternary ammonium salts are easily lost to the organic phase, resulting in a continuous decrease in the activity of binary catalysts in subsequent cycles.

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