Method for making caprolactam from impure ACN in which THA is not removed until after caprolactam is produced
US6858728B2 · kind B2 · utility
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4References
2Claims
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Key dates
| Filing date | Jun 17, 2003 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Jun 17, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Method for making caprolactam from 6-aminocapronitrile that contains greater than 500 ppm tetrahydroazepine and its derivatives (THA) in which the THA is not removed from the method until after the caprolactam is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.