Preparation of alkylene carbonates

Details Preparation of alkylene carbonates Preparation of alkylene carbonates

1990-03-26

1992-08-11

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31712

Patent

active

051380730

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 in the region of the critical temperature of carbon dioxide, preferably 25.degree.-70.degree. C. and at autogenerated pressures, typically 30 to 200 kg/cm.sup.2 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 selectivity to the formation of the carbonate.

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