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:
Jun. 26, 2007
Filed:
Jun. 30, 2006
Xiaogen Feng, Cao County, CN;
Nongyue Wang, Cao County, CN;
Xiaohui Mao, Cao County, CN;
Ruibiao Yu, Cao County, CN;
Qianwen Cheng, Cao County, CN;
Xiaogen Feng, Cao County, CN;
Nongyue Wang, Cao County, CN;
Xiaohui Mao, Cao County, CN;
Ruibiao Yu, Cao County, CN;
Qianwen Cheng, Cao County, CN;
Sinorgchem Co., Shandong, Shandong Province, CN;
Abstract
A process for preparing 4-aminodiphenylamine having the steps of reacting nitrobenzene and aniline in the presence of a complex base catalyst, hydrogenating the reaction mixture with hydrogen, a powdery composite catalyst, and a hydrogenation solvent; separating, recovering, and reusing the complex base catalyst and the powdery composite catalyst from the reaction mixture; separating, recovering, and reusing aniline, and optionally water, from the the reaction mixture; refining the reaction mixture to obtain 4-aminodiphenylamine. The complex base catalyst comprises tetraalkyl ammonium hydroxide, and tetraalkyl ammonium salt.