Azeotrope(like) mixtures of two hexafluoropropane stereoisomers
AssigneeE. I. Du Pont de Nemours and Company
InventorsTuneen E. C. Chisolm, Barbara H. Minor
Life of this patent
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Abstract
This invention relates to compositions of a hexafluoropropane and a hydrofluorocarbon, with the hydrofluorocarbon being hexafluoropropane, pentafluoropropane, tetrafluoropropane, trifluoropropane, difluoropropane, fluoropropane, or (CF.sub.3).sub.2 CHCH.sub.3. The compositions, which may be azeotropic or azeotrope-like, may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents or displacement drying agents.
Claims6
An azeotropic or azeotrope-like composition consisting essentially of (i) about 1-99 weight percent 1,1,2,2,3,3-hexafluoropropane and about 99-1 weight percent 1,1,1,3,3,3-hexafluoropropane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 25.4 and about 39.5 psia;
- (ii) about 1-99 weight percent 1,1,1,2,2,3-hexafluoropropane and about 1-99 weight percent 1,1,2,3,3,3-hexafluoropropane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 27.6 and about 33.5 psia;
- (iii) about 1-99 weight percent 1,1,1,2,2,3-hexafluoropropane and about 99-1 weight percent 1,1,1,3,3,3-hexafluoropropane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 33.8 and about 41.7 psia;
- and (iv) about 1-99 weight percent 1,1,2,3,3,3-hexafluoropropane and about 1-99 weight percent 1,1,1,3,3,3-hexafluoropropane, wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure of between about 30.1 and about 41.4, wherein the change in vapor pressure of the original composition and the composition remaining after 50 percent has been removed, is less than ten percent.
An azeotropic or azeotrope-like composition consisting essentially of (i) about 1-99 weight percent 1,1,2,2,3,3-hexafluoropropane and about 99-1 weight percent 1,1,1,3,3,3-hexafluoropropane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 25.4 and about 39.5 psis;
- (ii) about 1-99 weight percent 1,1,1,2,2,3-hexafluoropropane and about 1-99 weight percent 1,1,2,3,3,3-hexafluoropopane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 27.6 and about 33.5 psia;
- (iii) about 1-99 weight percent 1,1,1,2,2,3-hexafluoropropane and about 99-1 weight percent 1,1,1,3,3,3-hexafluoropropane wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure between about 33.8 and about 41.7 psis;
- and (iv) about 1-99 weight percent 1,1,2,3,3,3-hexafluoropropane and about 1-99 weight percent 1,1,1,3,3,3-hexafluoropropane, wherein when the temperature has been adjusted to about 25.degree. C., said composition has a vapor pressure of between about 30.1 and about 41.4 and wherein said compositions (i)-(iv) form binary compositions having a maximum or minimum vapor pressure when compared to the vapor pressures of the components of the binary composition.
Dependencies are inferred from the claim text.