PROCESS FOR PURIFYING ETHYLENE CARBONATE, PROCESS FOR PRODUCING PURIFIED ETHYLENE CARBONATE, AND ETHYLENE CARBONATE
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United States of America Patent
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Issued Date -
Sep 3, 2009
app pub date -
Mar 16, 2007
filing date -
Mar 20, 2006
priority date (Note) -
Abandoned
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Abstract
Ethylene carbonate having a highly reduced content of especially diols is provided.A process for purifying ethylene carbonate, including falling crude ethylene carbonate crystals from an upper portion of a tower, melting the crude ethylene carbonate crystal in a bottom portion of the tower, withdrawing a part of the obtained melt from the tower, and flowing the remainder of the obtained melt as a reflux liquid upward for countercurrent contact with the falling crude ethylene carbonate crystals, characterized in that a solid-liquid countercurrent contact region maintained at a constant temperature is formed.
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