Recently our group published a set of (p,q,T) data for two (carbon dioxide + nitrogen) mixtures with a low carbon dioxide content (x_CO2 = 0.10, 0.15). These data showed larger relative deviations from the GERG-2008 equation of state than expected, specially at low temperatures, high pressures, and for the mixture with higher carbon dioxide content (x_CO2 = 0.15). In order to analyze whether the mentioned deviations from the equation of state increase with the carbon dioxide content, it was decided to measure the (p,rho,T) behavior of two additional mixtures with higher carbon dioxide molar fractions (x_CO2 = 0.20, 0.50). The new experimental data show again an appreciable disagreement with the GERG-2008 equation of state at low temperatures and high pressures. Relative deviations, which depend on temperature, arise to 0.4% at 250 K and 20 MPa and to 0.24% at 275 K and 20 MPa for the x_CO2 = 0.20 and x_CO2 = 0.50 mixture, respectively. Second virial coefficients are calculated for the two new mixtures presented in this work and also for those presented in our previous paper.
Compounds
#
Formula
Name
1
N2
nitrogen
2
CO2
carbon dioxide
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
2
1
2nd virial coefficient, m3/mol ; Gas
Temperature, K; Gas
Mole fraction - 2; Gas
Gas
Derived graphically
27
POMD
2
1
Mass density, kg/m3 ; Gas
Temperature, K; Gas
Pressure, kPa; Gas
Mole fraction - 2; Gas
Gas
Buoyancy - hydrostatic balance with magnetic suspension - one sinker