METHOD FOR MANUFACTURING HOLLOW FIBER MEMBRANE
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United States of America Patent
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Issued Date -
May 16, 2024
app pub date -
Apr 4, 2022
filing date -
Apr 6, 2021
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Abstract
A method for manufacturing a hollow fiber membrane wherein a spinning stock solution containing 10 mass % or more and 40 mass % or less of a polysulfone-based resin, 1 mass % or more and 30 mass % or less of polyvinylpyrrolidone, and 1 mass % or more and 80 mass % or less of N,N-dimethylformamide is discharged together with a core liquid from a double-ring nozzle to produce a hollow fiber membrane by dry-wet spinning, and then the hollow fiber membrane is subjected to a dry heat treatment at a temperature of 80° C. or higher and 100° C. or lower for 48 hours or longer and 168 hours or shorter.
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