ABSTRACT

A new circulation-type vapor liquid equilibrium (VLE) apparatus was developed, and two binary systems of pentafluoroethane (R125) + propane (R290) and pentafluoroethane (R125) + 1,1,1,2,3,3,3-heptafluoropropane (R227ea) were measured. The estimated uncertainties of the measured data are +-0.005 K for temperatures, +-600 Pa for pressures, and +-0.001 for mole fractions for both the liquid and vapor phases. The VLE data for the R125 + R290 system were used to validate the experimental setup by comparing with the literature ones. The experimental VLE data for the two measured systems were correlated using the Peng Robinson equation of state with the classical mixing rules. The two systems were further described using predictive model.

Compounds

#	Formula	Name
1	C2HF5	pentafluoroethane
2	C3H8	propane
3	C3HF7	1,1,1,2,3,3,3-heptafluoropropane

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	5
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	5
POMD	3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	5
POMD	2 1	Azeotropic pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	By P(X) extreme	5
POMD	2 1	Azeotropic composition: mole fraction - 1 ; Liquid	Temperature, K; Liquid	Liquid Gas	By T or P extreme	5
POMD	2 1	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	56
POMD	2 1	Mole fraction - 1 ; Gas	Mole fraction - 1; Liquid Temperature, K; Gas	Gas Liquid	Chromatography	56
POMD	1 3	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Liquid Gas	Twin ebulliometer	46
POMD	1 3	Mole fraction - 1 ; Gas	Mole fraction - 1; Liquid Temperature, K; Gas	Gas Liquid	Chromatography	46

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Isothermal vapor liquid equilibria for the pentafluoroethane + propane and pentafluoroethane + 1,1,1,2,3,3,3-heptafluoropropane systems

Hou, S.-X.[Shu-Xin], Duan, Y. -Y.[Yuan-Yuan]

ABSTRACT