Process for preparing diaryl carbonates from dialkyl carbonates

US9040732B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Andre Düx · Bogen, DE
• Guenter Olf · Zülpich, DE
• Kaspar Hallenberger · Leverkusen, DE
• Georg Ronge · Mülheim an der Ruhr, DE
• Ricarda Leiberich · Langen, DE
• Johan Vanden Eynde · Zwijnaarde, BE
• Wim Wuytack · Zele, BE
• Pieter Ooms · Krefeld, DE
• Johann Rechner · Krefeld, DE

Key dates

• Filing date: Jun 12, 2009
• Grant date: May 26, 2015
• Expiry date: Dec 21, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.