Process for depolymerizing polycaprolactam processing waste to form caprolactam
US5948908A · kind A · utility
1Cited by
19References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1996 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Mar 18, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides an improved process for the recovery of caprolactam from polycaprolactam processing waste. The present process for depolymerizing polycaprolactam waste to form caprolactam comprises the step of: in the absence of added catalyst, contacting the polycaprolactam waste with superheated steam at a temperature of about 250.degree. C. to about 400.degree. C. and at a pressure within the range of about 1.5 atm to about 100 atm and substantially less than the saturated vapor pressure of water at the temperature wherein a caprolactam-containing vapor stream is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.