Multi-phase catalysis synthesis method for cyclic carbonates

Abstract

The invention discloses a multiphase catalytic synthetic method for preparing cyclic carbonate by additional reaction of carbon dioxide and epoxy compound. The cyclic carbonate can be prepared at a high selectivity of up to more than 87% at 100-180 DEG C under the initial pressure of carbon dioxide of 0.1-6 MPa in the presence of metal composite oxide as the catalyst which is made by calcining Zn-M-Al hydrotalcite, wherein M is alkali earth metal, and organic tertiary amine is solvent and co-catalyst. The catalyst has simple preparation, good stability, no halogen, and repeated utilization.

Description

technical field [0001] The invention relates to a heterogeneous catalytic synthesis method for generating cyclic carbonate through cycloaddition reaction of carbon dioxide and epoxide. Background technique [0002] Carbon dioxide is the main greenhouse gas, but it is also the most abundant, cheap and non-toxic C1 resource on the earth. It can replace highly toxic phosgene and carbon monoxide as carbonylation reagents, and can be used as one of the basic "carbon building blocks" of organic chemicals. Therefore, the chemical fixation of carbon dioxide into high value-added organic chemicals has huge environmental value and economic value, which has become a hot topic of international research and development and one of the world's difficult projects. [References: Coord Chem Rev 153(1996) 155; 181(1999) 27; J Polym SciPart A: Polym Chem, 42(2004) 5561; Chem Rev 103(2003) 3857; Energy & Fuels 18(2004) 1126] [0003] Carbon dioxide and epoxides form cyclic carbonates (such as e...

AI Technical Summary

Problems solved by technology

The main disadvantage of the homogeneous catalyst system is that the preparation cost of the catalyst is expensive, the toxicity is high, the composition is complicated, it contains halogen, and it is difficult to recycle and use it; and the main problem of the current heterogeneous catalyst system is: low catalytic activity (leading to cycloaddition The reaction requires higher pressure, temperature and catalyst concentration), poor selectivity, faster deactivation, etc.