发明授权
- 专利标题： Process for purifying crude p-aminophenol
- 专利标题（中）： 粗制对氨基苯酚的纯化方法
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申请号： US886129申请日： 1978-03-13
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公开(公告)号： US4139562A公开(公告)日： 1979-02-13
- 发明人: Ryuichi Yamamoto , Yutaka Hirai , Teruyuki Nagata
- 申请人： Ryuichi Yamamoto , Yutaka Hirai , Teruyuki Nagata
- 申请人地址： JPX Tokyo
- 专利权人： Mitsui Toatsu Chemicals, Inc.
- 当前专利权人： Mitsui Toatsu Chemicals, Inc.
- 当前专利权人地址： JPX Tokyo
- 主分类号： A01N43/90
- IPC分类号： A01N43/90 ; C07C215/76 ; C07C85/26
摘要：
A process for purifying crude p-aminophenol which contains 4,4'-diaminodiphenyl ether and other impurities, which process comprising adding an alkali metal compound to the crude p-aminophenol in an aqueous medium in an atmosphere of an inert gas and, if necessary, in the presence of a reducing agent to give an aqueous solution of an alkali metal salt of p-aminophenol, and contacting the aqueous solution with an inert organic solvent immiscible with water to permit 4,4'-diaminodiphenyl ether and other impurities to be separated by extraction in the solvent.
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