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:
Apr. 01, 2014
Filed:
May. 10, 2011
Xiaogen Feng, Hangzhou, CN;
Nongyue Wang, Hangzhou, CN;
Xiaohui Mao, Lanxi, CN;
Ruibiao Yu, Hangzhou, CN;
Qianwen Cheng, Shanghai, CN;
Renping Jiao, Heze, CN;
Xiaogen Feng, Hangzhou, CN;
Nongyue Wang, Hangzhou, CN;
Xiaohui Mao, Lanxi, CN;
Ruibiao Yu, Hangzhou, CN;
Qianwen Cheng, Shanghai, CN;
Renping Jiao, Heze, CN;
Jiangsu Sinorgchem Technology Co., Ltd., Taizhou, Jiangsu Province, CN;
Abstract
A method for refining an organic composition containing 4-aminodiphenylamine, aniline, azobenzene, and phenazine, having the steps of feeding the organic composition to a first rectification column, producing a first effluent composition containing aniline, azobenzene, phenazine, and a small amount of 4-aminodiphenylamine at the top of the first rectification column and a second effluent composition containing crude 4-aminodiphenylamine at the bottom of the first rectification column, feeding the second effluent composition to a second rectification column, and producing a 4-aminodiphenylamine composition at the top of the second rectification column and a residual composition at the bottom of the second rectification column.