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:
Nov. 23, 2021
Filed:
Nov. 30, 2018
Zhejiang Nhu Company Ltd., Zhejiang, CN;
Zhejiang University, Zhejiang, CN;
Shandong Nhu Amino Acid Co., Ltd., Shandong, CN;
Shandong Nhu Fine Chemical Science and Technology Company Ltd., Shandong, CN;
Zhirong Chen, Zhejiang, CN;
Jianyong Mao, Shandong, CN;
Baishan Hu, Zhejiang, CN;
Guanbing Li, Zhejiang, CN;
Haoran Li, Zhejiang, CN;
Yu Wang, Zhejiang, CN;
Yingkuo Yang, Zhejiang, CN;
Qing Liu, Zhejiang, CN;
Jiyu Tang, Shandong, CN;
Weiyong Chen, Shandong, CN;
Zhejiang Nhu Company Ltd., Zhejiang, CN;
Zhejiang University, Zhejiang, CN;
Shandong Nhu Amino Acid Co., Ltd., Shandong, CN;
Shandong Nhu Fine Chemical Science and Technology Company Ltd., Shandong, CN;
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.