Purification of aqueous glyoxal solutions

US5000832A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Steiniger · Neustadt, DE
• Hartwig Voss · Bischofswerda, DE
• Leopold Hupfer · Friedelsheim, DE

Key dates

• Filing date: Dec 11, 1989
• Grant date: Mar 19, 1991
• Expiry date: Dec 11, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/80
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Aqueous glyoxal solutions which contain organic acids are purified by means of a membrane cell comprising two or more compartments by passing the glyoxal solution through at least one of the cell compartments separated from the neighboring compartment(s) by anion exchange membranes and by passing the aqueous solution of a base through at least one of the neighboring compartments.