公开(公告)号：US20210087133A1

公开(公告)日：2021-03-25

申请号：US16954774

申请日：2018-11-30

申请人： Zhejiang Nhu Company Ltd. ,  Zhejiang University ,  Shandong Nhu Amino Acid Co., Ltd. ,  Shandong Nhu Fine Chemical Science and Technology Company Ltd.

发明人： Zhirong CHEN ,  Jianyong MAO ,  Baishan HU ,  Guanbing LI ,  Haoran LI ,  Yu WANG ,  Yingkuo YANG ,  Qing LIU ,  Jiyu TANG ,  Weiyong CHEN

IPC分类号： C07C209/52 ,  C07C209/48 ,  B01J23/78 ,  B01J35/04

摘要： 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.