Homogeneous Catalytic Synthesis of Ethylene Carbonate Under Supercritical Condition

Abstract

Abstract: Tetradendate Schiff-base aluminum complexes were prepared and used as the catalysts for synthesizing ethylene carbonate from supercritical CO₂ and ethylene oxide mixture. Among them, SalenAl(OCH₂CH₂)₃Cl, possessing a long oxyethylene chain, was found to be more effective. Because of high miscibility of ethylene oxide in supercritical CO₂ under employed conditions, the cycloaddition of CO₂ with ethylene oxide under a supercritical condition shows a higher rate than that under a non-supercritical condition. The catalytic activities of these aluminum complexes can be markedly enhanced in the presence of a Lewis base, such as 1-MeIm. Also, the possible catalytic mechanism was proposed, based on some spectral data at a low temperature.

Key words: Supercritical CO₂, Ethylene oxide, Ethylene carbonate, Schiff-base aluminum complexes, Cycloaddition

CLC Number:

O643.32

TrendMD:

LU Xiao-Bing, ZHANG Hua, HE Ren. Homogeneous Catalytic Synthesis of Ethylene Carbonate Under Supercritical Condition[J]. Chem. J. Chinese Universities, 2002, 23(12): 2309.

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Homogeneous Catalytic Synthesis of Ethylene Carbonate Under Supercritical Condition

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