Use of mixtures based on difluoromethane and on pentafluorethane

Details Use of mixtures based on difluoromethane and on pentafluorethane Use of mixtures based on difluoromethane and on pentafluorethane

1997-11-26

2000-07-25

Skane, Christine

Compositions

Vaporization, or expansion, refrigeration or heat or energy...

62114, C09K 504

Patent

active

060933402

ABSTRACT:
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.

REFERENCES:
patent: 4978467 (1990-12-01), Shankland et al.
patent: 5185094 (1993-02-01), Shiflett
patent: 5403504 (1995-04-01), Bivens et al.
patent: 5643492 (1997-07-01), Shiflett
patent: 5736063 (1998-04-01), Richard et al.
patent: 5788877 (1998-08-01), Shiflett
Doering et al, "Thermodynamic properties of closely boiling mixtures of R32 and R125", DKV-Tagungsber, pp. 211,230, no month available, 1995.
Chemical Abstracts 125:145954, "Thermodynamic properties of closely boiling mixtures of R32 and R125", Doering et al., no month available, 1995.
Chemical Abstracts 123:203857, "Assessing Halon alternatives for aircraft engine nacelle fire suppression", Grosshandler et al., no month available, 1995.

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