Hydrofluorocarbon compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsBarbara H. Minor, Donald B. Bivens, Brooks S. Lunger
Life of this patent
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Abstract
Refrigerant compositions include mixtures of difluoromethane and isobutane, butane, propylene or cyclopropane; pentafluoroethane and propylene or cyclopropane; 1,1,2,2-tetrafluoroethane and propane; 1,1,1,2-tetrafluoroethane and cyclopropane; 1,1,1-trifluoroethane and DME or propylene; 1,1-difluoroethane and propane, isobutane, butane or cyclopropane; fluoroethane and propane or cyclopropane; 1,1,1,2,2,3,3-heptafluoropropane and butane, cyclopropane, DME, isobutane or propane; or 1,1,1,2,3,3,3-heptafluoropropane and butane, cyclopropane, isobutane or propane.
Claims9
An azeotropic or azeotrope-like composition consisting essentially of 66-99 weight percent pentafluoroethane and 1-34 weight percent cyclopropane said composition having a vapor pressure of about 195 psia to about 210 psia when the temperature is adjusted to about 25 degrees C., and wherein when about 50 weight percent of the composition is evaporated at about 25 degrees C., the vapor pressure changes less than about 10 percent.
A composition consisting essentially of about 91.3-99 weight percent pentafluoroethane and about 1-8.7 weight percent cyclopropane wherein the vapor pressure of the composition is higher than the vapor pressure of pentafluoroethane and cyclopropane at 25 degrees C., when the temperature has been adjusted to about 25 degrees C.
A composition consisting essentially of about 44-99 mole percent pentafluoroethane and about 1-56 mole percent cyclopropane wherein the vapor pressure of the composition is higher than the vapor pressure of pentafluoroethane and cyclopropane at 0 degrees C., when the temperature has been adjusted to about 0 degrees C.
Dependencies are inferred from the claim text.