Process for the continuous preparation of diaryl carbonates

US5498742A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Buysch · Krefeld, DE
• Carsten Hesse · Krefeld, DE
• Johann Rechner · Krefeld, DE
• Reinhard Schomacker · Leverkusen, DE
• Paul Wagner · Mülheim an der Ruhr, DE
• Dieter Kaufmann · Heidenheim, DE

Key dates

• Filing date: Jan 27, 1995
• Grant date: Mar 12, 1996
• Expiry date: Jan 27, 2015

Classification

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

Abstract

The invention relates to a process for the continuous preparation of diaryl carbonates by reaction of an aromatic hydroxyl compound with carbon monoxide and oxygen in the presence of a catalyst containing a noble metal of group VIIIb of the Periodic Table of the Elements, a quaternary salt, a cocatalyst and a base. The catalyst is activated by treatment with carbon monoxide in the liquid phase. The reaction water is removed by excess reaction gas.