Process for preparing aromatic carbonates

US5284965A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Buysch · Krefeld, DE
• Norbert Schon · Krefeld, DE
• Johann Rechner · Krefeld, DE

Key dates

• Filing date: Mar 3, 1993
• Grant date: Feb 8, 1994
• Expiry date: Mar 3, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J31/0212
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is described for preparing aromatic carbonates by transesterification of aliphatic carbonates with phenolic compounds in the presence of titanium compounds known per se, in which, before work-up, the transesterification mixture is cooled to a temperature below 120.degree. C., during which the mixture must remain liquid, the titanium-containing precipitate which is deposited is separated off, and the aromatic carbonate is then obtained by methods which are conventional per se.