Regeneration and extension of lifetime of dehydrogenation catalysts used in the preparation of 2-alkylpyrimidines
US5180700A · kind A · utility
0Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The useful life of the palladium dehydrogenation catalyst used in the preparation of 2-alkylpyrimidines from 1,3-diaminopropane and an appropriate alkanecarboxylic acid in a continuous vapor phase process is substantially increased by employing a stoichiometric excess of the carboxylic acid and by using catalyst pellets of less than 3-4 mm diameters. Additionally, the dehydrogenation catalyst can be regenerated in situ by controlled air oxidation below 350.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.