Process to prepare .epsilon.-caprolactam
US6194572A · kind A · utility
51Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1999 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Aug 18, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process to prepare .epsilon.-caprolactam by treating 6-aminocaproic acid, 6-aminocaproate ester or 6-aminocaproamide or mixtures comprising at least two of these compounds in the presence of superheated steam in which a gaseous mixture comprising .epsilon.-caprolactam and steam is obtained, wherein the process is carried out in the absence of a catalyst at a temperature between 250 and 400.degree. C. and at a pressure of between 0.5 and 2 MPa. The invention also encompasses a process to prepare .epsilon.-caprolactam starting from 6-aminocapronitrile by performing a hydrolysis and a subsequent step as described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.