Process for the production of diaryl carbonates

US5625091A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Buysch · Krefeld, DE
• Carsten Hesse · Krefeld, DE
• Johann Rechner · Krefeld, DE

Key dates

• Filing date: Jun 10, 1996
• Grant date: Apr 29, 1997
• Expiry date: Jun 10, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J21/063
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a new process for the production of aromatic carbonates from aromatic hydroxy compound, CO and O.sub.2 in contact with a platinum-group metal catalyst, a co-catalyst, a quaternary salt and a base at elevated temperature and elevated pressure, an improvement is achieved if the reaction water is removed continuously from a partial flow of the reaction under reduced pressure and largely isothermal conditions and the dehydrated partial flow is again supplied to the reaction.