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 1224793

ABSTRACT OF THE DISCLOSURE 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 in the region of the critical temperature of carbon dioxide, preferably 25-70°C and at autogenerated pressures, typically 30 to 200 kg/cm2 gauge. 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 corresponding alkylene glycol, With certain catalysts the presence of water improves the selecti- vity to the formation of the carbonate.

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