Separation of methylene chloride from ethyl ether by extractive distillation
US5092966A · kind A · utility
2Cited by
4References
1Claims
0Family size
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Key dates
| Filing date | Apr 1, 1991 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Apr 1, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Ethyl ester cannot be completely separated from methylene chloride by conventional distillation or rectification because of the maximum boiling azeotrope. Ethyl ether can be readily separated from methylene chloride by extractive distillation. Typical effective agents are t-butyl alcohol, n-propyl acetate or propoxypropanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.