发明授权
- 专利标题: Method for removing sulfur from fiber using an aqueous acid
- 专利标题(中): 使用含水酸从纤维中除去硫的方法
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申请号: US14371451申请日: 2012-01-11
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公开(公告)号: US09464370B2公开(公告)日: 2016-10-11
- 发明人: Steven R. Allen , Vlodek Gabara , Joseph Lenning Lowery , Steven Raymond Lustig , Christopher William Newton , David J. Rodini , Andrew J. Sitter
- 申请人: Steven R. Allen , Vlodek Gabara , Joseph Lenning Lowery , Steven Raymond Lustig , Christopher William Newton , David J. Rodini , Andrew J. Sitter
- 申请人地址: US DE Wilmington
- 专利权人: E I DU PONT DE NEMOURS AND COMPANY
- 当前专利权人: E I DU PONT DE NEMOURS AND COMPANY
- 当前专利权人地址: US DE Wilmington
- 国际申请: PCT/US2012/020853 WO 20120111
- 国际公布: WO2013/105937 WO 20130718
- 主分类号: C11D11/00
- IPC分类号: C11D11/00 ; D01F11/08 ; D01D10/06 ; D01F6/80
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.