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Title:
ACTIVATION OF HYDROGENATION CATALYST
Document Type and Number:
Japanese Patent JPH11292828
Kind Code:
A
Abstract:

To obtain 4-aminodiphenylamine at a low cost by hydrogenating 4-nitrosodiphenylamines in the presence of a hydrogenation catalyst, recovering the catalyst, and reusing the catalyst by hydrogen-treating the recovered catalyst in water and an organic solvent.

4-Nitrosodiphenylamines (e.g. 4-nitrosodiphenylamine) are hydrogenated by hydrogen gas having about 5-50 kg/cm2G pressure preferably in a solvent (e.g. a mixed solvent of water and benzene) in the presence of a hydrogenation catalyst (e.g. the catalyst obtained by allowing an activated carbon to carry about 1-5 wt.% Pd or Pt) preferably at about 0-100°C for about 0.5-10 hr, and the catalyst is recovered. The recovered catalyst is subjected to a hydrogen treatment in the water, an organic solvent (e.g. toluene) or a mixed solvent of the water and the organic solvent preferably at 0-200°C by the hydrogen gas having 0.1-100 kg/cm2G pressure for 0.5-10 hr to activate the hydrogenation catalyst in the method for activating the hydrogenation catalyst.


Inventors:
Kadota, Yoichi
Tanaka, Shin
Application Number:
JP1998000094678
Publication Date:
October 26, 1999
Filing Date:
April 07, 1998
Export Citation:
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Assignee:
SUMITOMO CHEM CO LTD
International Classes:
B01J23/42; B01J23/44; B01J23/96; B01J38/58; C07B61/00; C07C209/38; C07C211/50; (IPC1-7): C07C211/50; B01J23/42; B01J23/44; B01J23/96; B01J38/58; C07C209/38