Separation of tetrachloroethylene from the lower alcohols by extractive distillation
US5207876A · kind A · utility
6Cited by
4References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 17, 1992 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Jan 17, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Tetrachloroethylene cannot be completely separated from methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, 1-pentanol, 2-pentanol, 3-methyl-1-butanol or t-amyl alcohol by conventional distillation or rectification because of the minimum boiling azeotropes. Tetrachloroethylene 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.