Purification of .epsilon.-caprolactam
US4170592A · kind A · utility
4Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1977 |
| Grant date | Oct 9, 1979 |
| Priority date | — |
| Expiry date | Sep 9, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the purification of a solution of .epsilon.-caprolactam in benzene, toluene or xylene by washing with a liquid, wherein the washing liquid is a solution of .epsilon.-caprolactam in water in a weight ratio of from 15 : 1 to 1 : 3, which is used in a quantity of from 5 to 20% by weight, based on the solution of caprolactam in benzene, toluene or xylene, and wherein there are several washing stages so that the equilibrium between the two solutions can be readjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.