Process for producing diaryl carbonate

摘要

A process for producing diaryl carbonate of the present invention comprises steps of:(1) a diaryl carbonate production step of subjecting an aromatic monohydroxy compound and phosgene to condensation reaction at a temperature of 80 to 180° C. in the presence of an aromatic nitrogen-containing heterocyclic compound catalyst to obtain the diaryl carbonate;(2) a purification step of removing impurities from a hydrogen chloride gas by-produced upon the condensation reaction;(3) a chlorine recovery step of recovering chlorine usable for the production of phosgene from the purified hydrogen chloride gas; and(4) a phosgene production step of reacting the recovered chlorine with carbon monoxide to obtain phosgene usable in the diaryl carbonate production step.