Processes for producing epsilon caprolactams
US6300496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Oct 6, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates in part to processes for producing one or more substituted or unsubstituted epsilon caprolactams, e.g., epsilon caprolactam, which comprise (a) converting one or more substituted or unsubstituted hydroxyaldehydes, e.g., 6-hydroxyhexanal, optionally in the presence of a catalyst or a catalyst and promoter, to one or more substituted or unsubstituted hydroxyamides, e.g. 6-hydroxycaproamide, and/or one or more substituted or unsubstituted epsilon caprolactam precursors, e.g., 6-aminocaproamide, epsilon caprolactone, epsilon caprolactone oligomers and esters of 6-hydroxycaproic acid and mixtures thereof, and (b) converting said one or more substituted or unsubstituted hydroxyamides and/or said one or more substituted or unsubstituted epsilon caprolactam precursors, optionally in the presence of a catalyst or a catalyst and promoter, to said one or more substituted or unsubstituted epsilon caprolactams; wherein the amount of byproducts resulting from reduction and/or reductive amination of said one or more substituted or unsubstituted hydroxyaldehydes, e.g., 1,6-hexanediol, aminohexanol, and the like, is no greater than about 10 weight percent, preferably no great…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.