Process for the purification of .epsilon.-caprolactam
US4457807A · kind A · utility
14Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | May 7, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/11
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process is provided for recovering epsilon-caprolactam of a purity in excess of 99.9 wt. %, in a two-stage distillation operation. Each stage comprises an evaporator and a rectification column having a pressure drop across the theoretical trays thereof of less than about 2.5 MBAR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.