发明授权
US09464370B2 Method for removing sulfur from fiber using an aqueous acid 有权
使用含水酸从纤维中除去硫的方法

Method for removing sulfur from fiber using an aqueous acid
摘要:
The present invention concerns methods for removing sulfur from a fiber made from a polymer comprising imidazole groups, said method comprising: contacting never-dried sulfate anion-containing polymeric-fiber with an aqueous acid having a pKa of less than 5 to displace at least a portion of the sulfate anions; and b) rinsing the fiber to remove the displaced sulfate ions.
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