Regeneration of plastic diaphragm

US5755951A · kind A · utility

Assignee

• BASF SE

Inventors

• Rudi Kroner · Mannheim, DE
• Bernd Leutner · Bischofswerda, DE
• Hans-Michael Schneider · Worms, DE
• Holger Friedrich · Frankenthal (Pfalz), DE
• Kurt Hecky · Zeiskam, DE
• Dieter Schlafer · Ludwigshafen, DE
• Wolfgang Steiner · Friedelsheim, DE

Key dates

• Filing date: Jun 16, 1997
• Grant date: May 26, 1998
• Expiry date: Jun 16, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B15/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for the regeneration of plastic diaphragms is described, in which a mineral acid solution is mixed with a suitable corrosion inhibitor, this mixture is temperature controlled at from approximately 0.degree. to 100.degree. C., preferably 40.degree. to 80.degree. C., in particular 50.degree. to 70.degree. C., and passed through the diaphragm for from approximately 0.1 to 84 hours, preferably 1 to 72 hours, in particular 2 to 24 hours.