Plasma separation membrane

US8051991B2 · kind B2 · utility

Assignee

• GAMBRO LUNDIA AB · SE

Inventors

• Bernd Krause · Liederbach, DE
• Markus Hornung · Nehren, DE
• Herman Goehl · Bisingen, DE

Key dates

• Filing date: Jun 25, 2007
• Grant date: Nov 8, 2011
• Expiry date: Feb 26, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/139
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for manufacturing of an asymmetric hollow fiber membrane, comprising the steps of extruding a polymer solution through the outer ring slit of a hollow fiber spinning nozzle, simultaneously extruding a center fluid through the inner bore of the hollow fiber spinning nozzle, into a precipitation bath, whereby the polymer solution contains 10 to 26 wt-% of polysulfone (PSU), polyethersulfone (PES) or polyarylethersulfone (PAES), 8 to 15 wt-% polyvinylpyrrolidone (PVP), 55 to 75 wt-% N-alkyl-2-pyrrolidone (NAP) and 3 to 9 wt-% water the centre fluid contains 70 to 90 wt-% N-alkyl-2-pyrrolidone (NAP) and 10 to 30 wt-% water, and the precipitation bath contains 0 to 20 wt-% N-alkyl-2-pyrrolidone (NAP) and 80 to 100 wt-% water.