An experimental method was presented for vapor liquid equilibrium measurement by improving the PVT measurement apparatus. Isothermal vapor liquid equilibrium data for pentafluoroethane (HFC-125) + isobutane (HC-600a) were measured at (243.15, 253.15, 263.15, 272.15, 283.15, 293.15, 303.15, 313.15, 323.15, and 333.15) K at pressures up to 3.2 MPa. The experimental data were correlated with the Peng-Robinson equation of state with van der Waals mixing rules. The overall average absolute deviation between measured pressures and calculated results from the Peng-Robinson (PR) equation of state is 0.87 %. The interaction parameters k12 were obtained for different temperatures, and the values of k12 increase from 0.12 to 0.22 as the temperature increases.
Compounds
#
Formula
Name
1
C2HF5
pentafluoroethane
2
C4H10
2-methylpropane
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.