Preparation of alkylene carbonates

Details Preparation of alkylene carbonates Preparation of alkylene carbonates

C - Chemistry, Metallurgy

07

D

260/352.8

C07D 317/36 (2006.01) C07D 319/06 (2006.01) C07D 321/00 (2006.01)

Patent

CA 1248119

TITLE PREPARATION OF ALKYLENE CARBONATES ABSTRACT Alkylene carbonates, particularly ethylene carbonate, are prepared by the reaction of an alkylene oxide with carbon dioxide in the presence of a catalyst at temperatures ranging upwards from 20°C, particularly temperatures above about 90°C, preferably 90-170°C. The conversion of alkylene oxide to alkylene carbonate can be carried out in the presence of water while minimizing the undesirable hydrolysis of the carbonate to the correspond- ing alkylene glycol and formation of higher glycols. This is achieved by maintaining the water to alkylene oxide molar ratio and the carbon dioxide to alkylene oxide ratio within the stated limits and adjusting the carbon dioxide partial pressure to provide the desired selectivity to alkylene carbonate.

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