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Preparation of alkylene carbonates

  • US 4,786,741 A
  • Filed: 11/15/1982
  • Issued: 11/22/1988
  • Est. Priority Date: 11/15/1982
  • Status: Expired due to Fees
First Claim
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1. In a process for preparing alkylene carbonate by the reaction of the corresponding alkylene oxide with carbon dioxide in the presence of an effective amount of at least one catalyst selected from the group consisting of organic quaternary ammonium halides, organic quaternary phosphonium halides, organic sulfonium halides, and organic antimony halides and water, the improvement comprising controlling the selectivity of alkylene carbonate and suppressing formation of higher molecular weight glycols to produce high yields of alkylene carbonate by carrying out said reaction at temperatures above about 90°

  • C. with a molar ratio of carbon dioxide to alkylene oxide of at least about 1/1, a water to alkylene oxide molar ratio greater than about 0.01/1, and a carbon dioxide partial pressure sufficient to provide the selectivity to alkylene carbonate desired.

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