METHOD OF PRODUCING ALKANE DIOL AND DIALKYL CARBONATE Russian patent published in 2012 - IPC C07C68/06 C07C29/12 C07C31/20 C07C69/96 C07C27/02 C07C41/03 C07C43/11 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing alkane diol and dialkyl carbonate, involving: (a) reaction of starting alkylene carbonate and alkanol in a reaction zone in re-esterification conditions to obtain a mixture of products containing dialkyl carbonate, unconverted alkanol, alkane diol and unconverted alkylene carbonate; (b) separating dialkyl carbonate and unconverted alkanol from the mixture of products to obtain a bottom product stream containing alkane diol and unconverted alkylene carbonate; (c) extracting dialkyl carbonate; and (d) separating the stream containing alkane diol from the bottom product stream, leaving a recycled stream containing unconverted alkylene carbonate, wherein the recycled stream containing unconverted alkylene carbonate is split into at least two portions and at least one portion is recycled into the reaction zone and the other portion undergoes hydrolysis to obtain alkane diol and carbon dioxide.

EFFECT: method gives advantages which manifest in part of alkylene carbonate in the recycled stream being subjected to re-esterification once more in order to convert it to the desired dialkyl carbonate; furthermore, alkylene carbonate contained in the portion of the stream which undergoes hydrolysis is not completely lost since it is converted to carbon dioxide and alkane diol so as to obtain at least one of the end products; also, polyglycols, which may be present in the recycled stream of the reaction system, are accumulated.

14 cl, 1 dwg