Process for preparing diaryl carbonate

US8882984B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Pieter Ooms · Krefeld, DE
• Andreas Bulan · Langenfeld, DE
• Johann Rechner · Krefeld, DE
• Rainer Weber · Leverkusen, DE
• Michael Traving · Burscheid, DE
• Marc Buts · Duffel, BE
• Johan Vanden Eynde · Zwijnaarde, BE

Key dates

• Filing date: Apr 13, 2010
• Grant date: Nov 11, 2014
• Expiry date: Sep 23, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B15/081
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for preparing diaryl carbonate and utilizing at least part of the process wastewater by increasing the concentration of the wastewater phases containing sodium chloride for the electrolysis by means of osmotic membrane distillation with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the diaryl carbonate production process (diphenyl carbonate process) is described.