发明名称 |
Purification of N-methyl-2-pyrrolidone. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0346086(A2) |
申请公布日期 |
1989.12.13 |
申请号 |
EP19890305726 |
申请日期 |
1989.06.07 |
申请人 |
TOSOH CORPORATION;TOSO SUSTEEL CO., LTD. |
发明人 |
KATO, TOSHIKAZU;INOUE, HIROSHI;OGAWARA, KENSUKE |
分类号 |
C07D207/26;C07D207/267 |
主分类号 |
C07D207/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|