Process for producing polycarbonate

US8106144B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Pieter Ooms · Krefeld, DE
• Andreas Bulan · Langenfeld, DE
• Rainer Weber · Leverkusen, DE
• Johann Rechner · Krefeld, DE
• Michael Traving · Burscheid, DE

Key dates

• Filing date: May 21, 2010
• Grant date: Jan 31, 2012
• Expiry date: Jul 31, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2311/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process is described for producing polycarbonate and utilizing at least some of the process waste water by concentrating the sodium chloride-containing waste water phases for the electrolysis using osmotic membrane distillation, if appropriate with simultaneous dilution of the sodium hydroxide solution obtained from the electrolysis for the polycarbonate production process.