Method for producing diaryl carbonates

US10125083B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Karl-Heinz Köhler · Aachen, DE
• Ricarda Leiberich · Langen, DE
• Kaspar Hallenberger · Leverkusen, DE
• Korbinian Krämer
• Florian Lipski · Mülheim an der Ruhr, DE
• Henning Kahnis
• Gabriel Denecker · Kalmthout, BE
• Johan Vanden Eynde · Zwijnaarde, BE
• Weerachanan Somhom · Uttaradit, TH

Key dates

• Filing date: May 5, 2015
• Grant date: Nov 13, 2018
• Expiry date: May 9, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of an optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of crystallization and recovered.