Patent ID: 7288668
Filing Date: 2007-10-30
Classification: C07C

Abstract:
1. A process for the production of diaryl carbonate comprising the steps of feeding aromatic hydroxy and dialkyl carbonate to a distillation zone having a plurality of stages, withdrawing liquid comprising aromatic hydroxy and dialkyl carbonate from a first distillation stage to a first reaction zone to contact the liquid with a transesterification catalyst under conditions conducive to transesterification, returning a product from the first reaction zone to the distillation zone, withdrawing liquid comprising aryl alkyl carbonate from a second distillation stage which is positioned below said first distillation stage to a second reaction zone to contact the liquid with a disproportation catalyst under conditions conducive to disproportation, returning a product from the second reaction zone to the distillation zone, and separating diaryl carbonate as bottoms and alkyl alcohol as overheads.