Process for the preparation of &egr;-caprolactam
US6660857B2 · kind B2 · utility
49Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2002 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Aug 2, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of &egr;-caprolactam starting from 6-aminocaproic acid, 6-aminocaproamide, 6-aminocaproic ester, 6-aminocapronitrile, oligomers or polymers of these compounds or mixtures comprising at least two of these compounds, which process is performed in the presence of N-(5-carboxypentyl)-&egr;-caprolactam and/or derivative thereof in an amount of less than 50 wt. % and more than 0.1 wt. % (based on the total reaction mixture).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.