发明授权
- 专利标题： Purification of N-methyl-2-pyrrolidone
- 专利标题（中）： N-甲基-2-吡咯烷酮的纯化
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申请号： US363692申请日： 1989-06-09
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公开(公告)号： US4895959A公开(公告)日： 1990-01-23
- 发明人: Toshikazu Kato , Hiroshi Inoue , Kensuke Ogawara
- 申请人： Toshikazu Kato , Hiroshi Inoue , Kensuke Ogawara
- 申请人地址： JPX Amaguchi JPX Tokyo
- 专利权人： Tosoh Corporation,Toso Steel Co., Ltd.
- 当前专利权人： Tosoh Corporation,Toso Steel Co., Ltd.
- 当前专利权人地址： JPX Amaguchi JPX Tokyo
- 优先权： JPX63-141613 19880610
- 主分类号： C07D207/26
- IPC分类号： C07D207/26 ; C07D207/267
摘要：
A method for purifying N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide is disclosed, comprising adding a polyhalogenated aromatic compound and an alkali metal hydroxide and/or an alkali metal carbonate to the N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide, heat treating the mixture, and subjecting the mixture to separation by distillation. The thiophenol and/or diphenyl disulfide can be removed with ease and at low cost.
公开/授权文献
- US5608642A Component recognition method and device 公开/授权日：1997-03-04
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