Process for reactivating catalyst systems containing a platinum group metal

US6071843A · 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: May 2, 1997
• Grant date: Jun 6, 2000
• Expiry date: May 2, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Platinum metal-containing catalyst systems, which comprise at least one platinum metal, a co-catalyst and other salts, and which are used for the production of diaryl carbonates by the oxidative reaction of aromatic hydroxy compounds with carbon monoxide, can be reactivated by treating the deactivated catalyst system in the liquid phase with an oxidising agent, removing the excess oxidising agent, and reacting the reactivated catalyst system with a carboxylate or diketonate.