Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane and (iso) butane
AssigneeE. I. Du Pont de Nemours and Company
InventorsPhilip Lee Bartlett, Donald Bernard Bivens, Brooks Shawn Lunger, Akimichi Yokozeki
Life of this patent
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Abstract
The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, 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.
Claims13
An azeotropic or azeotrope-like composition consisting essentially of about 80-95 weight percent 1,1,2,2-tetrafluoroethane and about 5-20 weight percent n-butane;
- or about 70-95 weight percent 1,1,2,2-tetrafluoroethane and about 5-30 weight percent isobutane;
- wherein at 14.7 psia, the dew point and bubble point differs by less than or equal to one degree Celsius.
An azeotropic or azeotrope-like composition consisting essentially of about 80-99 weight percent 1,1,2,2-tetrafluoroethane and about 1-20 weight percent n-butane wherein at 14.7 psia, the maximum difference in the dew point and bubble point is about 7 degrees Celsius.
An azeotropic or azeotrope-like composition consisting essentially of about 70-99 weight percent 1,1,2,2-tetrafluoroethane and about 1-30 weight percent isobutane wherein at 14.7 psia, the maximum difference in the dew point and bubble point is about 7 degrees Celsius.
Dependencies are inferred from the claim text.