Hydrogenation of methylenedianiline
US6998507B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2004 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Aug 24, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to an improvement in a catalytic process for the ring hydrogenation of a methylenedianiline feedstock, including crude methylenedianiline. One component of the improvement is a pretreatment process which resides in passing the crude methylenedianiline feedstock over a ruthenium catalyst carried on a fixed bed support, cooling without venting, and then hydrogenation of the pretreated crude methylenedianiline feedstock over a rhodium catalyst or a mixed Rh/Ru catalyst carried on a monolith support and carrying out the ring hydrogenation in a batch reaction. Another component in the improvement is the employment of a catalyst comprised of rhodium and ruthenium carried on a monolith support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.