Process for the continuous production of diaryl carbonates

US5821377A · 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: Apr 1, 1997
• Grant date: Oct 13, 1998
• Expiry date: Apr 1, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/01
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the process for the production of diaryl carbonates by oxidative carbonylation of the underlying aromatic hydroxy compounds in the presence of a catalyst containing a platinum group metal, a co-catalyst, a quaternary salt and a base, the catalyst is used as a supported catalyst in a stationary arrangement or in the fluid phase and the reaction is performed in the condensed phase. The co-catalyst is preferably also attached to the support.