Azeotropic mixture with 1,1,1-trifluoroethane and propane a low boiling point and its applicatons as a refrigerant fluid, as an aerosol propellant, or as a blowing agent for plastic foams
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United States of America Patent
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Jan 14, 1992
Grant Date -
N/A
app pub date -
Apr 2, 1991
filing date -
Apr 2, 1990
priority date (Note) -
Expired
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Abstract
The invention relates to an azeotrope with a minimum boiling point, capable of being employed as a refrigerating fluid replacing trifluorobromomethane (Halon 1301) in industrial refrigeration systems at very low temperature with single-stage compression. The azeotrope according to the invention is a mixture of 1,1,1-trifluoroethane (HFA 143a) and of propane (R290). At the normal boiling point (approximately -53.4.degree. C. at 1.013 bars), its 1,1,1-trifluoroethane content is approximately 70.6 mass % and that of propane 29.4 %. This azeotrope can also be employed as an aerosol propellant or as a blowing agent for plastic foams.
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