Liberation of organic sulfonic acids

US5221443A · kind A · utility

Assignee

• BASF SE

Inventors

• Hartwig Voss · Bischofswerda, DE
• Rolf Schneider · Burgstetten, DE

Key dates

• Filing date: Nov 20, 1991
• Grant date: Jun 22, 1993
• Expiry date: Nov 20, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D61/445
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Organic sulfonic acids are liberated from aqueous solutions of their salts by a process in which the aqueous organosulfonate solution is subjected to electrodialysis with the aid of an electrodialysis cell which consists of diluate chambers DC, acid chambers AC and base chambers BC according to the sequence I EQU (MB/AC/MA/DC/MK/BC).sub.n I where MB is a bipolar ion exchange membrane, MA is an anion exchange membrane, MK is a cation exchange membrane and n is a number from 1 to 500.