Treatment/purification of lactam media of reaction
US6579979B2 · kind B2 · utility
4Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 21, 2001 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | May 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Lactam liquid media of reaction which comprise at least one lactam final product, notably &egr;-caprolactam, are treated and purified to convert impurities contained therein into harmless species or species easily removed downstream, by hydrogenating such liquid media of reaction in the presence of a hydrogenation catalyst and during which hydrogenation the liquid media of reaction have effective lactam-purifying amounts of ammonia dissolved therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.