The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Jul. 02, 2004
Applicants:
Xiaogen Feng, Shandong Province, CN;
Nongyue Wang, Shandong Province, CN;
Xiaohui Mao, Shandong Province, CN;
Ruibiao Yu, Shandong Province, CN;
Qianwen Cheng, Shandong Province, CN;
Inventors:
Xiaogen Feng, Shandong Province, CN;
Nongyue Wang, Shandong Province, CN;
Xiaohui Mao, Shandong Province, CN;
Ruibiao Yu, Shandong Province, CN;
Qianwen Cheng, Shandong Province, CN;
Assignee:
Sinorgchem Shandong Co., Ltd., Shandong, CN;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for preparing 4-aminodiphenylamine using nitrobenzene and aniline as raw materials, a complex base catalyst as the condensation catalyst, and a powdery composite catalyst as the hydrogenation catalyst. The process has 5 process stages including condensation, hydrogenation, separation I, separation II, and refining.