Method for reprocessing reaction mixtures containing diaryl carbonate

US6605191B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Carsten Hesse · Krefeld, DE
• Ursula Jansen · Krefeld, DE
• Johann Rechner · Krefeld, DE
• Claus-Peter Reisinger · Wixom, US
• Rob Eek · Bergen op Zoom, NL
• Kaspar Hallenberger · Leverkusen, DE
• Martin Friedrich · Harsum, DE

Key dates

• Filing date: Jun 15, 2001
• Grant date: Aug 12, 2003
• Expiry date: Jun 15, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the work up of a reaction mixture obtained from the preparation of diaryl carbonate by direct carbonylation of aromatic hydroxy compounds is disclosed. The process entails obtaining a reaction mixture that contains diaryl carbonate, aromatic hydroxy compound, water, base and quaternary salt, separating the mixture in a distillation apparatus having only one theoretical separation stage into a liquid phase and a gas phase and recycling the liquid phase without further work up to the reaction step of the direct carbonylation.