Process for producing diaryl carbonate
AssigneeMitsubishi Chemical Corporation
InventorsMasaaki Miyamoto, Narutoshi Hyoudou
Life of this patent
Estimating the term…
Abstract
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.
Claims9
A process for producing diaryl carbonate, comprising 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.
Dependencies are inferred from the claim text.