Societe Atochem

D'elf Atochem S.a.

Jean-Claude Tanguy

Sylvie Macaudiere

Didier Arnaud

To replace chlorofluorocarbons as refrigerant fluids, the invention proposes to employ mixtures containing, on a mass basis, approximately 25 to 65% of 1,1,1-trifluoroethane, 1 to 70% of perfluoropropane and 5 to 34% of propane. The mixtures according to the invention can also be employed as aerosol propellants or as blowing agents for plastic foams.

Mixtures of 1,1,1-trifluoroethane, perfluoropropane and propane, and

This invention proposes to employ a mixture of dimethyl ether and of 1,1,1,2-tetrafluoroethane as refrigerant fluids to replace chlorofluorocarbons. These compounds form an azeotrope which, at its normal boiling point (approximately -22.4.degree. C. at 1.013 bar), contains approximately 62.3 mass % of 1,1,1,2-tetrafluoroethane. The mixture according to the invention can also be employed as aerosol propellant or as blowing agent for plastic foams.

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Sannois, France

Jean-Claude Tanguy