PROCESS FOR THE PREPARATION OF AN ALKANEDIOL AND A DIALKYL CARBONATE

摘要

A process for the preparation of an alkanediol and a dialkyl carbonate is provided, which process comprises: (a) contacting an alkylene carbonate with an alkanol feedstock under transesterification conditions in a reactive distillation column to obtain an upwardly moving stream comprising dialkyl carbonate and the alkanol and a downwardly moving stream comprising the alkanediol; (b) recovering the alkanediol at the bottom of the column; (c) withdrawing a dialkyl carbonate-and alkanol-containing product stream at the upper part of the column, which upper part is below the top of the column; and (d) removing lower-boiling compounds at the top of the column. ® KIPO & WIPO 2009