Integrated process for preparing dialkyl carbonates with a circulating catalyst
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United States of America Patent
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Aug 1, 2006
Grant Date -
Mar 6, 2003
app pub date -
Jun 22, 2001
filing date -
Jun 22, 2001
priority date (Note) -
Expired
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Abstract
An integrated process for the production of a dialkyl carbonate and a diol from an alkylene oxide, carbon dioxide and an aliphatic monohydric alcohol is described in which an alkylene oxide is first reacted with carbon dioxide in the presence of a homogeneous carbonation catalyst to provide a corresponding cyclic carbonate and the cyclic carbonate is then reacted with an aliphatic monohydric alcohol in the presence of the homogeneous carbonation catalyst and/or a heterogeneous transesterification catalyst and recycling the homogeneous carbonation catalyst to provide a corresponding dialkyl carbonate and diol.
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