Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Density and Volumetric Behavior of CO2 + Undecane System from 313.15 to 353.15 K and Pressures up to 19 MPa

Zhang, Y.[Yi], Wang, L.[Lulu], Liu, S.[Shuyang], Song, Y.[Yongchen], Liu, Y.[Yu], Jiang, L.[Lanlan]
J. Chem. Eng. Data 2016, 61, 9, 3003-3012
ABSTRACT
Densities of compressed CO2 + undecane binary mixtures were measured using a magnetic suspension balance (MSB). Measurements were made at temperatures ranging from 313.15 to 353.15 K and pressures ranging from 8 to 19 MPa at CO2 mole fractions (x1) of 0, 0.2483, 0.4641, 0.6797, and 0.8874. The mixture densities were found to increase linearly with pressure and decrease with temperature; this behavior is similar to that of CO2 + decane or dodecane mixtures. The mixture densities show a crossover with composition when the CO2 mole fraction is high. The densities of alkanes increase almost linearly with carbon number, as do the densities of CO2 + alkane mixtures. With the of CO2 mole fraction, the mixture densities increase at first, then decrease. The increase of pressure makes the excess molar volume less negative, whereas the increase of temperature makes it more negative. Densities calculated from the perturbed hard chain equation of state (PHSC EOS) with improved parameters are in good agreement with the experimental densities. Adopting the constant binary interaction parameter kij for different alkanes in the PHSC EOS slightly enlarge the model deviation but simplifies the calculation.
Compounds
# Formula Name
1 CO2 carbon dioxide
2 C11H24 undecane
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
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Buoyancy - hydrostatic balance with magnetic suspension - one sinker
  • 43
  • 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)
  • Buoyancy - hydrostatic balance with magnetic suspension - one sinker
  • 147