Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
US7615137B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Aug 21, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D223/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol alkali hydroxide per kg of caprolactam; (b) reacting at least part of the added alkali hydroxide to form alkali amino caproate, to obtain a caproate-enriched caprolactam product; and (c) distilling the caproate-enriched caprolactam product at reduced pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.