Process for the production of alkylene carbonate and alkylene carbonate using the thus produced in the manufacture of alkane diol and a dialkyl carbonate

摘要

The process for producing an alkylene carbonate by reacting an alkylene oxide with dióxidode carbon in the presence of a phosphonium catalyst in which process (a) the alkylene oxide, carbon dioxide and the phosphonium catalyst are continuously introduced in unazona reaction of a product stream containing alkylene carbonate and elcatalizador phosphonium used it is removed, (b) alkylene carbonate and a stream containing the catalyst used phosphonium separated from lacorriente product, (c ) alkylene carbonate, separated in step (b), is recovered as product, (d) at least part of the stream containing the catalyst used phosphonium subjected to purification to obtain phosphonium catalyst purified, wherein part of the stream containing phosphonium catalizadorde used that is purified, is subjected to distillation at a distillation temperature ranging from 200 ° C 50a and at a pressure n for the distillation of 0.1 to 0.0001 bar (10 0,01 kPa), and (e) purified phosphonium catalyst is recycled to the reaction zone.