Separation of 1,1,1-trichloroethane from the lower alcohols by extractive distillation
US5196094A · kind A · utility
4Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Nov 8, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Nov 8, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
1,1,1-Trichloroethane cannot be completely separated from methanol, ethanol, n-propanol, isopropanol, 2-butanol or t-butanol by conventional distillation or rectification because of the minimum boiling azeotropes. 1,1,1-Trichloroethane can be readily separated from these alcohols by extractive distillation. A typical effective agent is dimethylsulfoxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.