Methods of preparing a crossliked fiber membrane
AssigneeChevron U.S.A. Inc.
InventorShabbir Husain
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Abstract
Disclosed herein is a method for preparing a crosslinked hollow fiber membrane. The method involves spinning a one phase solution comprising a monoesterified polyimide polymer, acetone as a volatile solvent, a spinning solvent, a spinning non-solvent, and optionally an organic and/or inorganic additive, wherein the volatile solvent is present in an amount of greater than 25 wt. % to about 50 wt. %, based on the total weight of the solution.
Claims20
A method for preparing a crosslinked hollow fiber membrane, the method comprising spinning into a monoesterifed fiber a one phase solution comprising a monoesterified polyimide polymer, acetone as a volatile solvent, a spinning solvent, and a spinning non-solvent, wherein the volatile solvent is present in an amount of greater than 25 wt. % to about 50 wt. %, based on the total weight of the solution;
- and
- subjecting the monoesterified fiber to one of esterfication and transesterification conditions to prepare a crosslinked hollow fiber membrane.
Dependencies are inferred from the claim text.