Separation of aliphatic diacids from adipic acid admixtures thereof
US5587056A · kind A · utility
1Cited by
4References
22Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 14, 1995 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Jun 14, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is separated from admixtures thereof with adipic acid, by at least partially converting such at least one aliphatic diacid into the corresponding anhydride thereof, and removing the corresponding anhydride or the adipic acid from the medium of conversion/anhydridization, for example by contemporaneous or subsequent distillation, or by crystallization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.