Recovery of caprolactam from caprolactam-containing distillation residue
US4563308A · kind A · utility
11Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Aug 21, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process the recovering caprolactam from the residue remaining following the distillation, under reduced pressure, of impure caprolactam obtained by rearrangement of cyclohexanone oxime with sulphuric acid or oleum, by distilling the residue under reduced pressure whereby a caprolactam-containing distillate is obtained; hydrogenating the caprolactam containing distillate in an aqueous medium to obtain a hydrogenation product; and recovering caprolactam from the resulting hydrogenation product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.