Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorsPhilip L. Bartlett, Donald B. Bivens, Brooks S. Lunger, Akimichi Yokozeki
Life of this patent
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Abstract
The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of 1,1-difluoroethane, 1-chloro-1,1,-difluoroethane, dimethyl ether, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
Claims9
An azeotrope-like composition consisting essentially of about 60-99 weight percent 1,1,2,2,-tetrafluoroethane and about 1 to 40 weight percent dimethyl ether said composition having a boiling temperature of about 0 degrees C. when the pressure is adjusted to about 28 psig and consists essentially of about 74 weight percent 1,1,2,2-tetraflu
Dependencies are inferred from the claim text.