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AssigneeE. I. Du Pont de Nemours and Company
InventorsBarbara H. Minor, Tuneen E. C. Chisolm, Glenn S. Shealy
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Refrigerant compositions include mixtures of hexafluorodimethyl ether and cyclopropane, dimethylether or propylene; bis(difluoromethyl) ether and 2,2,3,4,4-pentafluorooxetane; fluoromethyl trifluoromethyl ether and 2,2,4,4,5,5-hexafluoro-1,3-dioxolane, 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane, dimethylether or tris(trifluoromethyl)amine; trifluoromethyl methyl ether and perfluorooxetane, 2,2,4,4,5,5-hexafluoro-1,3-dioxolane, perfluoromethyl ethyl ether, perfluorodinethoxymethane, 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane, dimethylether or tris(trifluoromethyl)amine; perfluoromethyl ethyl ether and dimethylether, propylene or 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane; perfluorodirnethoxymethane and dimethylether or isobutane; 1-trifluoromethoxy-1,1,2,2-tetrafluoroethane and tris(trifluoromethyl)amine or dimethylether; difluoromethoxy pentafluoroethane and dimethylether, isobutane or tris(trifluoromethyl)amine; 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane and dimethylether or isobutane; 1-difluoromethoxy-1,1,2,2-tetrafluoroethane and N(CHF.sub.2).sub.2 (CF.sub.3); or 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2,2-tetrafluoroethoxy)propane and 1,1,2,2,3-pentafluoropropane or 1,1,1,2,3-pentafluoropropane.
An azeotropic or azeotrope-like composition consisting essentially of about 1 to about 60 weight percent 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2,2-tetrafluoroethoxy)propane and about 40 to about 99 weight percent of 1,1,2,2,3-pentafluoropropane wherein said composition has a vapor pressure of about 15 psia at 25.degree. C.
An azeotropic or azeotrope-like composition consisting essentially of about 1 to about 30 weight percent 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2,2-tetrafluoroethoxy)propane and about 70 to about 99 weight percent of 1,1,1,2,3-pentafluoropropane wherein said composition has a vapor pressure of about 16.4 psia at 25.degree. C.
An azeotropic or azeotrope-like composition consisting essentially of 98-99 weight percent 1,1,1,2,2,3,3-heptafluoro-3(1,2,2,2-tetrafluoroethoxy)propane and 1-2 weight percent of 1,1,1,2,3-pentafluoropropane wherein said composition has a vapor pressure of about 8.5 to 9 psia at 25.degree. C.
A binary composition consisting essentially of component (a) about 1 to about 25 mole percent 1,1,1,2,2,3,3-heptafluoro-3(1,2,2,2-tetrafluoroethoxy)propane and component (b) about 75 to about 99 mole percent of 1,1,2,2,3-pentafluoropropane wherein at 19.05.degree. C. said binary composition has a vapor pressure higher than component (a) or (b).
A binary composition consisting essentially of component (a) about 1 to about 15 mole percent 1,1,1,2,2,3,3-heptafluoro-3(1,2,2,2-tetrafluoroethoxy)propane and component (b) about 85 to about 99 mole percent of 1,1,1,2,3-pentafluoropropane wherein at 14.14.degree. C. said binary composition has a vapor pressure higher than component (a) or (b).
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