Patents by Inventor Weiyong CHEN

Weiyong CHEN 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).

  • Method for preparing isophorone diamine by means of hydrogenation reduction of isophorone nitrile imine
    Patent number: 11180440
    Abstract: The present disclosure relates to a method for preparing isophorone diamine by means of a hydrogenation reduction of isophorone nitrile imine. The hydrogenation reduction is continuously carried out in a multi-stage bubble column reactor loaded with a supported alkaline cobalt-based catalyst, wherein isophorone nitrile imine is successively in countercurrent contact with hydrogen in each stage of the reactor to carry out a hydrogenation reduction reaction, so as to obtain the isophorone diamine. The preparation method solves the problem of back-mixing, and further improves the conversion rate and the cis/trans ratio of the product.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: November 23, 2021
    Assignees: Zhejiang Nhu Company Ltd., Zhejiang University, Shandong Nhu Amino Acid Co., Ltd., Shandong Nhu Fine Chemical Science and Technology Company Ltd.
    Inventors: Zhirong Chen, Jianyong Mao, Baishan Hu, Guanbing Li, Haoran Li, Yu Wang, Yingkuo Yang, Qing Liu, Jiyu Tang, Weiyong Chen
  • METHOD FOR PREPARING ISOPHORONE DIAMINE BY MEANS OF HYDROGENATION REDUCTION OF ISOPHORONE NITRILE IMINE
    Publication number: 20210087133
    Abstract: The present disclosure relates to a method for preparing isophorone diamine by means of a hydrogenation reduction of isophorone nitrile imine. The hydrogenation reduction is continuously carried out in a multi-stage bubble column reactor loaded with a supported alkaline cobalt-based catalyst, wherein isophorone nitrile imine is successively in countercurrent contact with hydrogen in each stage of the reactor to carry out a hydrogenation reduction reaction, so as to obtain the isophorone diamine. The preparation method solves the problem of back-mixing, and further improves the conversion rate and the cis/trans ratio of the product.
    Type: Application
    Filed: November 30, 2018
    Publication date: March 25, 2021
    Inventors: Zhirong CHEN, Jianyong MAO, Baishan HU, Guanbing LI, Haoran LI, Yu WANG, Yingkuo YANG, Qing LIU, Jiyu TANG, Weiyong CHEN