METHOD OF PRODUCING ALKANEDIOL AND DIALKYL CARBONATE Russian patent published in 2014 - IPC C07C31/20 C07C29/128 C07C69/96 C07C68/06 C07C27/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing alkanediol and dialkyl carbonate, which includes: (a) reacting alkylene carbonate and alkanol in the presence of a re-esterification catalyst to obtain a reaction mixture containing dialkyl carbonate, unconverted alkanol, alkanediol and unconverted alkylene carbonate; (b) distilling the reaction mixture in a first distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing dialkyl carbonate, alkanol, alkanediol and alkylene carbonate; (c) distilling the bottom stream from the first distillation column in a second distillation column to obtain an upper stream containing dialkyl carbonate and alkanol, and a bottom stream containing alkanediol and alkylene carbonate; (d) extracting alkanediol from the bottom stream of the second distillation column and (e) distilling the upper streams of the first and second distillation columns in a third distillation column to obtain an upper stream containing alkanol, and a bottom stream containing dialkyl carbonate.

EFFECT: method enables to obtain dialkyl carbonate using a more energy-efficient method.

10 cl, 2 dwg, 4 tbl, 1 ex