Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Measurement and correlation of the diffusion coefficients of chromium (III) acetylacetonate at infinite dilution in supercritical carbon dioxide and in liquid ethanol

Kong, C. Y.[Chang Yi], Watanabe, K.[Kou], Funazukuri, T.[Toshitaka]
J. Chem. Thermodyn. 2017, 105, 86-93
ABSTRACT
The diffusion coefficients of chromium(III) acetylacetonate (Cr(acac)3) were measured at infinite dilution in supercritical carbon dioxide and in liquid ethanol. The diffusion measurements in supercritical carbon dioxide were carried out at five different temperatures varying from T = (308.15 to 343.15) K and at pressures up to 40.00 MPa by using the chromatographic impulse response (CIR) method. And the measurements in liquid ethanol were also made by the Taylor dispersion method at five temperatures in the range from T = (299.15 to 333.15) K and 0.10 MPa. The determined diffusion activation energies in supercritical carbon dioxide were Ea = (22.9 11.2) kJ mol 1 at p = (13.00 35.00) MPa, respectively, and that in liquid ethanol was 15.9 kJ mol 1 at 0.10 MPa. All the diffusion coefficients of Cr(acac)3 in supercritical and in liquid states can be correlated by the hydrodynamic equation as a function of temperature and fluid viscosity with average absolute relative deviation (AARD) of 4.6% over a wide viscosity range from g = (3.036 10 5 to 1.113 10 3) Pa s for 85 data points.
Compounds
# Formula Name
1 C15H21CrO6 tris(2,4-pentanedionato)chromium
2 C2H6O ethanol
3 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
  • 3
  • 1
  • Binary diffusion coefficient, m2/s ; 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)
  • Chromatographic impulse response
  • 80
  • POMD
  • 2
  • 1
  • Binary diffusion coefficient, m2/s ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Mole fraction - 1; Liquid
  • Liquid
  • Taylor dispersion method
  • 5