Hollow fibre membrane with improved separating efficiency, and production of a hollow fibre membrane with improved separating efficiency

• Main Authors: Paul, Michael, Keller, Torsten, Sander, Roland
• Format: Patent
• Language: English
• Published: 22.06.2023
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention relates to a method for producing a hollow fibre membrane bundle from a plurality of polysulphone-based and PVP-based hollow fibre membranes, involving: providing a spinning solution comprising a material based on polysulphone, particularly polysulphone, a polymer based on vinylpyrrolidone and particularly polyvinylpyrrolidone, an aprotic solvent, particularly dimethylacetamide; providing a coagulation liquid comprising water and an aprotic solvent, particularly dimethylacetamide; coextruding the spinning solution and the coagulation liquid through a concentric annular gap nozzle to form a hollow spun filament, the cavity of said spun filament being filled with coextruded coagulation liquid; passing the spun filament through a precipitation gap; introducing the spun filament into a precipitation bath substantially comprising water, in order to obtain a hollow fibre membrane; passing the hollow fibre membranes through at least one rinsing bath and drying the resulting hollow fibre membrane; arranging the resulting hollow fibre membrane to form a hollow fibre membrane bundle; and treating the hollow fibre membrane bundle with steam.