Method for production of solution-diffusion membranes and their application for pervaporation

US4865743A · kind A · utility

Assignee

• GFT Gesellschaft fur Trenntechnik mbH · DE

Inventors

• Guido Ellinghorst · Overath, DE
• Bernd Goetz · Leverkusen, DE
• Axel Niemoeller · Meißen, DE
• Horst Scholz · Warstein, DE
• Hartmut E. A. Brueschke · Schallstadt, DE
• Guenter F. Tusel · Homburg, DE

Key dates

• Filing date: Dec 29, 1986
• Grant date: Sep 12, 1989
• Expiry date: Dec 29, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2323/385
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

For producing solution/diffusion membranes, homogeneous dense films prepared by melt extrusion or casting from synthetic polymers, having a melting temperature above 140.degree. C., a glass transition temperature above 0.degree. C. and long time stability against boiling ethanol are irradiated with accelerated electrons and submitted to a subsequent radical graft copolymerization. After graft polymerzation, the functional groups are converted into the dissociated salts.