Azeotrope-like compositions containing difluoromethane, pentafluoroethane, and carbon dioxide
AssigneeE. I. Du Pont de Nemours and Company
InventorDonald Bernard Bivens
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Abstract
Refrigerant compositions are disclosed which are non-flammable when vapor charged and which perform as well as compositions of 50 weight percent difluoromethane and 50 weight percent pentafluoroethane.
Claims3
An azeotrope-like composition consisting essentially of 49-55 weight percent difluoromethane, 40-49.5 weight percent pentafluoroethane and about 0.5-3 weight percent carbon dioxide, said composition having a liquid and a vapor phase, wherein when 50 weight percent of an initial composition is evaporated the vapor pressure of the composition changes by less than about 10 percent and further wherein said composition is nonflammable in the vapor phase.
Dependencies are inferred from the claim text.