Process for the purification of diphenyl carbonate

US5495038A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Buysch · Krefeld, DE
• Christine Mendoza-Frohn · Erkrath, DE
• Johann Rechner · Krefeld, DE
• Norbert Schon · Krefeld, DE

Key dates

• Filing date: Jun 5, 1995
• Grant date: Feb 27, 1996
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention provides a process for the purification of diphenyl carbonate (DPC) from crude products of diphenyl carbonate production. In this process, crude products are used that have a distillable fraction consisting of over 70 wt. % diphenyl carbonate and are fractionally crystallised from the melt (fractionating melt crystallisation).