Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Isochoric Heat Capacities of Propane+Isobutane Mixtures at Temperatures from 280 to 420 K and at Pressures to 30 MPa

Kitajima, H., Kagawa, N., Tsuruno, S., Wantanabe, K.
Int. J. Thermophys. 2005, 26, 6, 1733-1742
ABSTRACT
The isochoric heat capacity (cv ) and pressure volume temperature-composition (pvTx) properties were measured for propane+isobutane mixtures in the liquid phase and in the supercritical region. The expanded uncertainty (k =2) of temperature measurements is estimated to be +-13 mK, and that of pressure measurements is +-8 kPa. The expanded relative uncertainty for cv is +-3.2% for the liquid phase, increasing to +-4.8% for near-critical densities. The expanded uncertainty for density is estimated to be +-0.16%. The present measurements for {xC3H8 +(1-x)i-C4H10} with x =0.0, 0.498, 0.756, and 1.0, were obtained at 659 state points at temperatures from 270 to 420K and at pressures up to 30MPa. The experimental data were compared with a published equation of state.
Compounds
# Formula Name
1 C3H8 propane
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.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Molar heat capacity at constant volume, J/K/mol ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Vacuum adiabatic calorimetry
  • 38
  • POMD
  • 2
  • Molar heat capacity at constant volume, J/K/mol ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Vacuum adiabatic calorimetry
  • 6
  • POMD
  • 1
  • 2
  • Molar heat capacity at constant volume, J/K/mol ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Mole fraction - 1; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Vacuum adiabatic calorimetry
  • 85
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Mole fraction - 1; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • ISOCHOR
  • 85