Azeotropic mixture of linear hydrofluorocarbon and HF
AssigneeE. I. Du Pont de Nemours and Company
InventorsMario J. Nappa, V. N. Mallikarjuna Rao, Allen C. Sievert
Life of this patent
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Abstract
Linear hydrofluorocarbons of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 F where X is H or F, and n is 1 to 7 when X is H and 0 to 7 when X is F, are produced by a vapor phase catalytic reaction of HF with corresponding compounds of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 OY where Y is --(CO)Cl or --SO.sub.2 Cl. Azeotropic compositions with HF (e.g., an azeotrope of CHF.sub.2 CF.sub.2 CH.sub.2 F and HF) are provided, and a portion of the linear hydrofluorocarbon product (e.g., a portion of the CHF.sub.2 CF.sub.2 CH.sub.2 F) may be recovered as an azeotropic composition and recycled.
Claims5
An azeotropic composition consisting essentially of from about 52 to 83 mole percent HF and from about 48 to 17 mole percent CHF.sub.2 CF.sub.2 CH.sub.2 F, which forms an azeotrope boiling at a temperature between about -10.degree. C. and 130.degree. C. at a pressure between about 43 kPa and 3385 kPa.
An azeotrope composition consisting essentially of from about 52 to 83 mole percent HF and from about 48 to 17 mole percent CHF.sub.2 CF.sub.2 CH.sub.2 F, which forms an azeotrope boiling at a temperature between about -10.degree. C. and 130.degree. C. at a pressure between about 43 kPa and 3385 kPa;
- said azeotropic composition including a composition selected from the group consisting of a composition consisting essentially of about 76 mole percent HF and about 24 mole percent HCF.sub.2 CF.sub.2 CH.sub.2 F, a composition consisting essentially of about 52 mole percent HF and48 mole percent HCF.sub.2 CF.sub.2 CH.sub.2 F, and a composition consisting essentially of about 83 mole percent HF and 17 mole percent HCF.sub.2 CF.sub.2 CH.sub.2 F.
An azeotropic composition consisting essentially of about 76 mole percent HF and about 24 mole percent CHF.sub.2 CF.sub.2 CH.sub.2 F, which forms an azeotrope boiling at a temperature of about 20.degree. C. and a pressure of about 154 kPa.
Dependencies are inferred from the claim text.