REFINING METHOD FOR ETHYLENE CARBONATE, METHOD FOR PRODUCTION OF REFINED ETHYLENE CARBONATE, AND ETHYLENE CARBONATE

摘要

PROBLEM TO BE SOLVED: To provide ethylene carbonate, particularly with extremely reduced content of diols. SOLUTION: The refining method for ethylene carbonate comprises: letting down a crude ethylene carbonate crystal from the top of a tower; melting the carbonate crystal on a tower bottom; extracting a part of the obtained melt from the tower; and ascending the remainder of the melt as a reflux liquid to perform the counter flow contact with the descending crude ethylene carbonate crystal. The method is characterized by creating a solid/liquid counter flow contact region at a constant temperature. COPYRIGHT: (C)2008,JPO&INPIT