Process for the continuous manufacture of aryl alkyl carbonate and diaryl carbonate using vapor recompression

摘要

Process for preparing an alkyl aryl carbonate and adiaryl carbonate, comprising (a) reacting a dialkyl carbonate and an aromatic hydroxy compound in a production column (200) to form the alkyl aryl carbonate and the diaryl carbonate; (b) directing a bottom stream of the production column to a reboiler (205), wherein the bottom stream comprises the alkyl aryl carbonate and the diaryl carbonate; (c) heating the bottom stream in the reboiler (205) with heat from an overhead stream of the production column (200) to result in a heated bottom stream; (d) directing a first portion of the heated bottom stream back into the production column (200), wherein the first portion comprises phenol; and (e) collecting the diaryl carbonate and the alkyl aryl carbonate from a second portion of the heated bottom stream.