Elf Atochem S.a.

D'elf Atochem S.a.

Sylvie Macaudiere

Jean-Claude Tanguy

To replace bromotrifluoromethane (R-13B1) in very low temperature refrigeration, the invention proposes to employ a mixture containing, on a mass basis, 25 to 50% of difluoromethane and 50 to 75% of pentafluoroethane. A third component may be incorporated in this mixture.

Use of mixtures based on difluoromethane and on pentafluorethane as

To replace the azeotropic mixture of chlorodifluoromethane and chloropentafluoroethane (R-502) in low-temperature refrigeration, the invention proposes to use a pseudo-azeotropic mixture containing 45 to 50% by weight of chlorodifluoromethane, 44 to 48% by weight of 1,1,1-trifluoroethane, and 6 to 8% by weight of pentafluoroethane. The thermodynamic properties of this mixture are very similar to those of mixture R-502.

Pseudo-azeotropic mixture of chlorodifluoromethane,

In order to replace the chlorodifluoromethane in air conditioning systems, the invention proposes the use, as refrigerant fluid, of a mixture containing by mass from 26 to 34% of difluoromethane, from 56 to 73% of 1,1,1,2-tetrafluoroethane and from 1 to 10% of tetrafluoromethane or octafluoropropane.

Nonazeotropic mixtures containing difluoromethane and

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.

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Asnieres, France

Sylvie Macaudiere