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US 4,229,263 AGranted
Recovery of methyl heptafluorobutyrate from methanol by distillation
AssigneePhillips Petroleum Company
InventorWilliam V. Childs
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Abstract
Esters are treated with alkali metal borohydride to produce alcohols. Substantially constant boiling admixtures of: methanol/methyl heptafluorobutyrate, water/1,1-dihydroheptafluorobutanol, and water/methyl heptafluorobutyrate are described.
Claims5
A substantially constant boiling admixture of methanol and methyl heptafluorobutyrate characterized by a boiling point of about 56.degree.-58.degree. C. at substantially atmospheric pressure.
A process of separating an admixture comprising methanol and methyl heptafluorobutyrate which comprises the steps of:
- (a) distilling a mixture comprising methanol and methyl heptafluorobutyrate to produce an overhead methanol/methyl heptafluorobutyrate azeotrope,
- (b) condensing said overhead,
- (c) adding water to the condensed overhead, thereby effecting a phase separation into a predominantly aqueous methanol liquid phase and a predominantly ester-containing liquid phase,
- (d) separating said phases,
- (e) returning the predominantly ester-containing liquid phase to said distillation step until the methanol content in said admixture is substantially exhausted,
- thereby obtaining a substantially pure methyl heptafluorobutyrate.
3 more elements
Dependencies are inferred from the claim text.