Claims
- 1. A near-azeotropic composition consisting essentially of 35-65 percent by weight pentafluoroethane, 30-60 percent by weight 1,1,1-trifluoroethane and 3-15 percent by weight 1,1,2,2-tetrafluoroethane and having a vapor pressure of about 164 to about 177 psia at about 24.degree. C., wherein the composition exhibits a change in vapor pressure of less than about 6.8 percent after about 80 weight percent of the composition is lost by evaporation, and wherein the amount of 1,1,1-trifluoroethane in the vapor phase of the composition does not increase after about 85 weight percent of the composition is lost by evaporation.
- 2. A near-azeotropic composition consisting essentially of 55 percent by weight percent pentafluoroethane, 40 weight percent 1,1,1-trifluoroethane, and about 5 percent by weight 1,1,2,2-tetrafluoroethane and having a vapor pressure of about 164.3 to about 176.3 psia at about 24.degree. C., wherein the composition exhibits a change in vapor pressure of less than about 6.8 percent after about 80 weight percent of the composition is lost by evaporation, and wherein the amount of 1,1,1-trifluoroethane in the vapor phase of the composition does not increase after about 85 weight percent of the composition is lost by evaporation.
- 3. The near-azeotropic composition of claim 1 consisting essentially of about 50 to 60 percent by weight percent pentafluoroethane, about 35 to 45 weight percent 1,1,1-trifluoroethane, and about 3 to 10 percent by weight 1,1,2,2-tetrafluoroethane.
- 4. A process for producing refrigeration which comprises evaporating a near-azeotropic composition of any of claims 3, 2, or 1 in the vicinity of a body to be cooled.
REFERENCE TO RELATED APPLICATION
This application is a continuation of patent application Ser. No. 08/293,784 filed Aug. 22, 1994, now abandoned, which is a continuation of patent application Ser. No. 07/893,065 filed Jun. 3, 1992, now abandoned, which is a continuation of patent application Ser. No. 07/681,565 filed Apr. 5, 1991, now abandoned, which is a continuation-in-part of patent application Ser. No. 07/558,346 filed Jul. 26, 1990 and now abandoned.
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Continuations (3)
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293784 |
Aug 1994 |
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893065 |
Jun 1992 |
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681565 |
Apr 1991 |
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Continuation in Parts (1)
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558346 |
Jul 1990 |
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