发明名称 |
Process for the purification of aromatic amines |
摘要 |
Aromatic amines which have been obtained by reduction of aromatic nitro compounds are purified by mixing the crude amine obtained after phase separation with an aqueous, alkali metal hydroxide solution and subsequent distillation of this mixture over a distillation column. The distillation column has at least an upper and a lower rectifying part and a stripping part. The bottom product of the distillation column is partly to completely sluiced out and is partly evaporated in a main evaporator and at least one downstream re-evaporator and partly recycled back into the column.
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申请公布号 |
US8455691(B2) |
申请公布日期 |
2013.06.04 |
申请号 |
US20080228722 |
申请日期 |
2008.08.15 |
申请人 |
SOMMER KNUT;GEHLEN FRANZ-ULRICH;LEHNER PETER;DUEX ANDRE;MAROTZ BENIE;BAYER MATERIALSCIENCE AG |
发明人 |
SOMMER KNUT;GEHLEN FRANZ-ULRICH;LEHNER PETER;DUEX ANDRE;MAROTZ BENIE |
分类号 |
C07C211/00 |
主分类号 |
C07C211/00 |
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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