Azeotropic or azeotrope-like compositions of ammonia and tetrafluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark Brandon Shiflett, Akimichi Yokozeki
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Abstract
Constant boiling azeotropic or azeotrope-like compositions of ammonia and 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, difluoromethane, pentafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane are disclosed that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
Claims4
A mixture consisting essentially of an azeotropic or azeotrope-like composition consisting of either (a) 20 to 99 weight percent ammonia and about 1 to 80 weight percent 1,1,1,2-tetrafluoroethane, wherein said composition boils at about 0.degree. C. when the pressure is adjusted to about 62.2 to 70.4 psia;
- or (b) about 40 to 99 weight percent ammonia and about 1 to 60 weight percent 1,1,2,2-tetrafluoroethane, wherein said composition boils at about 0.degree. C. when the pressure is adjusted to about 58.1 to 61.9 psia.
Dependencies are inferred from the claim text.