Process for cleaning hollow fibers
AssigneeAkzo Nobel N.V.
InventorsWolfgang Ansorge, Ralf Hornscheidt, Andreas Jungheim, Klaus Muller
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Abstract
The invention relates to a process for removing a lumen filler and/or undesired auxiliary processing agents from hollow fibers or hollow fiber membranes by extraction with supercritical gases. The invention likewise relates to the hollow fibers or hollow fiber membranes freed of a lumen filler and/or undesired auxiliary processing agents by this process.
Claims12
A process for removing a lumen filler, undesired auxiliary processing agents, or both from finished hollow fibers or finished hollow fiber membranes, comprising extracting the finished hollow fibers or finished hollow fiber membranes with a supercritical gas.
A hollow fiber or hollow fiber membrane, wherein said hollow fiber or hollow fiber membrane has a residual content of lumen filler of less than 500 ppm, said lumen filler comprising isopropyl myristate, wherein said hollow fiber or hollow fiber membrane is produced by a process comprising removing the lumen filler, undesired auxiliary processing agents, or both from a finished hollow fiber or finished hollow fiber membrane by extracting the finished hollow fiber or finished hollow fiber membrane with a supercritical gas.
Dependencies are inferred from the claim text.