p?Tx-property measurements near saturation in the gaseous phase for propane (1) + isobutane (2) at x1 = 0.25 (w1 = 20.19 %), x1 = 0.5 (w1 = 43.14 %), and x1 = 0.80 (w1 = 75.22 %) are reported. The data near saturation in the gaseous phase are important information for deriving reliable property values such as specific heats near saturation or for determining the second and third virial coefficients. The measurements were performed using a magnetic suspension densimeter. 154 p?Tx values for propane + isobutane mixtures were obtained at the temperatures of (303.15 and 323.15) K and for pressures up to 980 kPa. The experimental uncertainties are estimated to be 10 mK for temperature, 0.45 kPa for pressure, (0.03 % + 0.005 kg*m-3) for density, and 0.31 % in mass fraction (0.32 % in mole fraction). The purities of propane and isobutane were both 99.99 % in mass fraction according to the report from the manufacturer. The measurements are used for assessing the reliability of existing equations 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
2
Mass density, kg/m3 ; Gas
Mole fraction - 1; Gas
Temperature, K; Gas
Pressure, kPa; Gas
Gas
Buoyancy - hydrostatic balance with magnetic suspension - two sinkers