Method for preparing isophorone diamine by means of hydrogenation reduction of isophorone nitrile imine
US11180440B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 30, 2018 |
| Grant date | Nov 23, 2021 |
| Priority date | — |
| Expiry date | Jan 27, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.