Patent ID: 8779180
Filing Date: 2014-07-15
Classification: C07C

Abstract:
1. A process for removing an alkanol impurity from a stream containing an organic carbonate and the alkanol impurity, comprising contacting the stream with a catalyst to effect reaction of the alkanol impurity with the organic carbonate, wherein the organic carbonate is a di(C 1 -C 5 )alkyl carbonate and the alkanol impurity is an ether alkanol and wherein the stream containing an organic carbonate and the alkanol impurity is obtained by a process for the preparation of a di(C 1 -C 5 )alkyl carbonate and an alkanediol comprising: (a) reacting an alkylene carbonate and an alkanol in the presence of a transesterification catalyst to obtain a product mixture containing unconverted alkylene carbonate, unconverted alkanol, di(C (b) separating unconverted alkylene carbonate and alkanediol from the product mixture to obtain a top stream containing unconverted alkanol, di(C (c) recovering the alkanediol; and (d) separating unconverted alkanol from the top stream containing unconverted alkanol di(C which process further comprises (e) contacting the bottom stream containing di(C