Process for purifying lactams
US7270752B2 · kind B2 · utility
1Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2000 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Dec 27, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. This crystallization is carried out on the cyclization reaction medium after hydrogenation, removal of volatile compounds, and treatment with an ion-exchange resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.