Method for removing sulfur from fiber using halide acid ion exchange
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United States of America Patent
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Oct 11, 2016
Grant Date -
Nov 6, 2014
app pub date -
Jan 11, 2012
filing date -
Jan 11, 2012
priority date (Note) -
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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 halide-containing acid to displace at least a portion of the sulfate ions with halide anions; and b) rinsing the fiber to remove the displaced sulfate ions.
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