Separation of methylene chloride from the lower alcohols by extractive distillation
US5152876A · kind A · utility
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4References
2Claims
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Key dates
| Filing date | Mar 27, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Mar 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methylene chloride cannot be completely separated from methanol or ethanol by conventional distillation or rectification because of the mimimum boiling azeotrope. Methyelne chloride can be readily separated from methanol or ethanol by azeotropic or extractive distillation. Typical effective agents are: for methanol by azeotropic distillation, isopropanol or t-butanol; by extractive distillation, 1-nitropropane or n-butanol; for ethanol by extractive distillation, isobutanol or n-propyl acetate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.