Recovery of hexamethylenediamine (HMD) with low polarographically reducible impurities (PRI) from mixtures of HMD, aminocapronitirle and PRI
US6248926A · kind A · utility
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1Claims
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Key dates
| Filing date | Oct 26, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Oct 26, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for separating a mixture of hexamethylenediamine, aminocapronitile and polarographically reducible impurities using fractional distillation in which the temperature in the rectifying zone of a distillation column varies sigmoidally along its length to force a major portion of the PRI to co-distill with the aminocapronitrile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.