Hollow fiber membranes with improved separation efficiency and production of hollow fiber membranes with improved separation efficiency

摘要

The present invention is a method of producing a hollow fiber membrane bundle from a plurality of polysulfone-based and PVP-based hollow fiber membranes, comprising polysulfone-based materials, especially polysulfones, vinylpyrrolidone-based polymers, especially polyvinylpyrrolidone, Providing a spinning solution containing a protic solvent, especially dimethylacetamide, preparing a coagulating liquid containing water and an aprotic solvent, especially dimethylacetamide, and coextruding the spinning solution and a coagulating liquid from a concentric annular gap nozzle. And forming a hollow spun filament, wherein the cavity of the spun filament is filled with a coextrusion coagulation liquid, passing the spun filament through a settling gap, water to obtain a hollow fiber membrane. The step of introducing the spinning filaments into a precipitation bath substantially containing, the step of passing the hollow fiber membrane through at least one rinsing bath, and drying the obtained hollow fiber membrane, and the obtained hollow fiber membrane. A method comprising arranging the bundles to form a bundle and treating the hollow fiber membrane bundle with steam.