Weakly basic anion exchangers, processes for their preparation by aminolysis and their use for removing sulphate ions from aqueous liquids

US5612383A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harold Heller · Narberth, US
• Franz-Rudolf Minz · Dormagen, DE
• Reinhold Klipper · Neunburg vorm Wald, DE
• Alfred Mitschker · Odenthal, DE
• Heiko Hoffmann · Simi Valley, US

Key dates

• Filing date: May 18, 1995
• Grant date: Mar 18, 1997
• Expiry date: May 18, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/32
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Weakly basic anion exchangers of the poly(meth)acrylamide type which have been prepared by aminolysis of poly(meth)acrylonitrile or poly(meth)acrylate with polyamines of defined composition have an improved absorption capacity for sulphate ions and are suitable for selectively removing sulphate ions from aqueous liquids, in particular from sodium chloride brine and from waste waters.