发明名称 |
Purification of N-acetyl aminophenols |
摘要 |
A process for increasing the color-free shelf life of a crude N-acetyl aminophenol prepared by the acetylation of an aminophenol wherein the N-acetyl aminophenol contains color-forming impurities which are the products of oxidation of the aminophenol and other side reactions. The process comprises dissolving the crude N-acetyl aminophenol in a solvent containing a reducing agent, heating the solution at about the boiling point, crystallizing the N-acetyl aminophenol from the solution, washing the crystalline N-acetyl aminophenol with solvent containing reducing agent and thereafter separating and drying the crystalline N-acetyl aminophenol.
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申请公布号 |
US4474985(A) |
申请公布日期 |
1984.10.02 |
申请号 |
US19830462495 |
申请日期 |
1983.01.31 |
申请人 |
MONSANTO COMPANY |
发明人 |
KEEL, BILLY L.;KLAUS, IRVIN S.;OFTEDAHL, MARVIN L. |
分类号 |
C07C233/16;(IPC1-7):C07C103/38 |
主分类号 |
C07C233/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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