Invention Grant
- Patent Title: Process for the purification of aromatic amines
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Application No.: US12228722Application Date: 2008-08-15
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Publication No.: US08455691B2Publication Date: 2013-06-04
- Inventor: Knut Sommer , Franz-Ulrich Gehlen , Peter Lehner , Andre Düx , Benie Marotz
- Applicant: Knut Sommer , Franz-Ulrich Gehlen , Peter Lehner , Andre Düx , Benie Marotz
- Applicant Address: DE Leverkusen
- Assignee: Bayer MaterialScience AG
- Current Assignee: Bayer MaterialScience AG
- Current Assignee Address: DE Leverkusen
- Agent Lyndanne M. Whalen
- Priority: DE102007039091 20070818
- Main IPC: C07C211/00
- IPC: C07C211/00

Abstract:
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.
Public/Granted literature
- US20090065347A1 Process for the purification of aromatic amines Public/Granted day:2009-03-12
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