Hydrofluorocarbon compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsBarbara Haviland Minor, Donald Bernard Bivens, Brooks Shawn 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.
Claims5
A maximum pressure azeotropic or azeotrope-like composition consisting essentially of 65-99 weight percent difluoromethane and 1-35 weight percent butane having a vapor pressure ranging from about 229.1 to about 246.8 psia when the temperature has been adjusted to about 25.degree. C.
Dependencies are inferred from the claim text.