Compositions – Vaporization – or expansion – refrigeration or heat or energy...
Reexamination Certificate
2007-09-04
2011-11-29
Webb, Gregory (Department: 1761)
Compositions
Vaporization, or expansion, refrigeration or heat or energy...
C252S068000
Reexamination Certificate
active
08066899
ABSTRACT:
The present disclosure relates to non-ignitable gaseous compositions comprising difluoromethane and tetrafluoroethylene. When the pressure is at least 150 psig, the molar percentage of tetrafluoroethylene in the non-ignitable gaseous composition is no more than 111.6−0.124X. When the pressure is less than 150 psig, the molar percentage of tetrafluoroethylene in the non-ignitable gaseous composition is no more than 102−0.06X. X is the pressure in the unit of psig.The present disclosure also provides processes for making such non-ignitable gaseous compositions.Also disclosed are azeotropic compositions of TFE and HFC-32.
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M. M. Renfrew et al., Polytetrafluoroethylene. Heat-Resistant, Chemically Inert Plastic, Industrial and Engineering Chemistry, 1946, vol. 38:870-877.
J. Lee et al., Vapor-Liquid Equilibria for Hydrogen Fluoride and Difluoromethane, 1,1,1,12-Tetrafluoroethane, and + 1-Chloro-1,2,2,2-Tetrafluoroethane at 283.3 and 298.2 K, J. Chem. Eng. Data, 1996, vol. 41:43-46.
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E.I. du Pont de Nemours and Company
Webb Gregory
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