Purification of caprolactam
US4239682A · kind A · utility
2Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1976 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Nov 10, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the purification of acid-containing crude caprolactam obtained by the rearrangement of cyclohexanone oxime, wherein the crude caprolactam is mixed with from 0.8 to 2.0 equivalents of a base, from 3 to 6 parts by weight of toluene, based on caprolactam and from 2 to 10 parts by weight of water, based on inorganic constituents, separating the mixture into a toluene phase and two aqueous phases the upper of which containing all contaminants and discarding this phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.