Patents by Inventor Renping JIAO

Renping JIAO has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing 4-aminodiphenylamine
    Patent number: 8686188
    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.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: April 1, 2014
    Assignee: Jiangsu Sinorgchem Technology Co., Ltd.
    Inventors: Xiaogen Feng, Nongyue Wang, Xiaohui Mao, Ruibiao Yu, Qianwen Cheng, Renping Jiao
  • PROCESS FOR PREPARING 4-AMINODIPHENYLAMINE
    Publication number: 20120053367
    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.
    Type: Application
    Filed: May 10, 2011
    Publication date: March 1, 2012
    Applicant: Jiangsu Sinorgchem Technology Co., Ltd.
    Inventors: Xiaogen FENG, Nongyue WANG, Xiaohui MAO, Ruibiao YU, Qianwen CHENG, Renping JIAO