Process for the continuous preparation of diaryl carbonates from dialkyl carbonates

US5334742A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Schon · Krefeld, DE
• Reinhard Langer · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Paul Wagner · Mülheim an der Ruhr, DE

Key dates

• Filing date: Aug 6, 1993
• Grant date: Aug 2, 1994
• Expiry date: Aug 6, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diaryl carbonates are prepared by reaction from dialkyl carbonates and phenols using conventional transesterification catalysts in a specific mass-coupled and energy-coupled combination of columns, for example according to FIG. 1, in which the reference numerals have the meaning specified in the description.