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US 9,284,665 B2Granted
Method for removing sulfur from fiber using halide salt ion exchange
AssigneeE. I. Du Pont de Nemours and Company
InventorsChristopher William Newton, David J. Rodini, Joseph Lenning Lowery, Steven R. Allen, Vlodek Gabara
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Abstract
The present invention concerns methods for removing sulfur from a fiber made from a polymer comprising imidazole groups, said method comprising: a) contacting never-dried sulfate anion containing polymeric-fiber with an aqueous salt solution comprising halide anions to displace at least a portion of the sulfate anions with halide anions; and b) rinsing the fiber to remove displaced sulfate anions.
Claims14
A method for removing sulfur from a fiber made from a polymer comprising imidazole groups, said method comprising:
- a) contacting never-dried sulfate anion containing polymeric-fiber with an aqueous salt solution comprising halide anions to displace at least a portion of the sulfate anions with halide anions;
- and
- b) rinsing the fiber to remove displaced sulfate anions.
Dependencies are inferred from the claim text.