Patent ID: 9006476
Filing Date: 2015-04-14
Classification: C07C

Abstract:
1. A process for producing a high-purity dimethyl carbonate, the process comprising: (I) cooling a commercial grade dimethyl carbonate comprising more than 1 ppm of chlorine by operating a cooling fluid at a cooling temperature ranging from +6° C. to −5° C. at a cooling rate ranging from 0.5° C./hour to 2° C./hour, to obtain a first dimethyl carbonate in solid form; (II) heating the dimethyl carbonate in solid form, in a first heating, by operating the cooling fluid at a heating temperature ranging from −5° C. to +6° C. at a heating rate ranging from 1° C./hour to 5° C./hour, to obtain a mixture comprising a second dimethyl carbonate in solid form and a predetermined amount of a first dimethyl carbonate in liquid form, wherein the first dimethyl carbonate in liquid form is present in the mixture in an amount ranging from 15% to 30% by weight with respect to a total weight of the commercial grade dimethyl carbonate; (III) separating the first dimethyl carbonate in liquid form from the mixture, to obtain the second dimethyl carbonate in solid form; and (IV) heating the second dimethyl carbonate in solid form, in a second heating, by operating the cooling fluid at a heating temperature ranging from 20° C. to 40° C., to obtain a second dimethyl carbonate in liquid form, wherein the second dimethyl carbonate in liquid form has a purity degree higher than 99.99% and a chlorine content lower than or equal to 1 ppm.