A PROCESS FOR PREPARING 4-AMINODIPHENYLAMINE

Title:

A PROCESS FOR PREPARING 4-AMINODIPHENYLAMINE

Document Type and Number:

WIPO Patent Application WO/2005/003078

Kind Code:

A1

Abstract:

The present invention discloses a process for preparing 4-aminodiphenylamine using nitrobenzene and aniline as raw materials, comprising five procedures of condensation; hydrogenation; separation, recovery and recycle of complex alkali catalyst and separation, recovery and recycle of complex powdered catalyst optionally at least part of which is regenerated; separation, recovery and recycle of aniline and separation, recovery and recycle of solvent for hydrogenation; purification, wherein complex alkali catalyst is used as condensation catalyst, complex powdered catalyst is used as hydrogenation catalyst. This process may be carried out continuously. The present invention selects two catalysts of which the price is cheap, activity is high; reaction conditions are mild, side products are few; the process of preparation may be continuous, suitable for the production under industrial scale; the content of 4aminodiphenylamine prepared may be more than 99% (by weight), the production yield under industrial scale may be more than 95%.

Inventors:

WANG NONGYUE (CN)
FENG XIAOGEN (CN)
MAO XIAOHUI (CN)
YU RUIBIAO (CN)
CHENG QIANWEN (CN)

Application Number:

PCT/CN2004/000733

Publication Date:

January 13, 2005

Filing Date:

July 02, 2004

Export Citation:

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Assignee:

WANG NONGYUE (CN)
SHI GUANGQIANG (CN)
FENG XIAOGEN (CN)
MAO XIAOHUI (CN)
YU RUIBIAO (CN)
CHENG QIANWEN (CN)

International Classes:

C07C209/86; C07C209/36; C07C209/60; C07C209/82; C07C211/55; (IPC1-7): C07C209/02; C07C209/36; C07C209/38

Foreign References:

US5453541A	1995-09-26
EP0566783A1	1993-10-27
US6395933B1	2002-05-28
US6395934B1	2002-05-28
CN1307556A	2001-08-08
US5739403A	1998-04-14

Other References: