Thermodynamics of vaporization of some freons and halogenated ethanes and propanes

Abstract

The enthalpies of vaporization of freons CF 3CH 2CHCl 2 (R-243), Δ vap H ° m ( 298.15 ) ( calor ) = 34.05 ± 0.04 kJ mo l − 1 , and CF 3CH 2CCl 3 (R-233), Δ vap H ° m ( 298.15 ) ( calor ) = 36.76 ± 0.08 kJ mo l − 1 , have been calorimetrically determined at T = 298.15 K. The ideal gas thermodynamic functions S°( T), C ° p ( T ) , H°( T) − H°(0), and −[ G°( T) − G°(0)]/ T of freons CF 3CH 2CH 2Cl (R-253fa) and R-243 were calculated over the temperature range from 100 to 1000 K by statistical thermodynamics and Density Functional Theory methods using the Gaussian 03 software package. Experimental vapour pressures determined lately at the “atmospheric” pressure range 7(44)–99.5(87) kPa were extended to the entire range of the liquid phase for 10 freons and 2 dichloroethanes. Reviewed data on the normal boiling temperatures, the enthalpies of vaporization, critical parameters, triple point temperatures, enthalpies of fusion, and entire temperature ranges of the liquid phases were tabulated for 13 freons and 8 halogenated ethanes and propanes.