Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Solubilities of cobalt(III) and chromium(III) acetylacetonates in supercritical carbon dioxide at elevated temperatures

Haruki, M.[Masashi], Ohara, M.[Minami], Kihara, S.-i.[Shin-ichi], Takishima, S.[Shigeki]
Fluid Phase Equilib. 2013, 357, 50-56
ABSTRACT
The solubilities of cobalt(III) and chromium(III) acetylacetonates (Co(acac)3and Cr(acac)3) in supercritical carbon dioxide (scCO2) were measured at high temperatures to accumulate new experimental data and to clarify the temperature dependency of solubility across a wide range of temperatures. An apparatus based on a static method was newly developed by connecting a UV-vis spectrometer with optical fibers to determine the solubility. The solubilities of both Co(acac)3and Cr(acac)3 increased with increasing temperature at a constant CO2 density. Moreover, the relationships between the logarithm of CO2density and that of solubility were almost linear for both metal complexes at the experimental conditions. On the other hand, the isobaric curves for the solubilities had local minimum values on thetemperature-solubility plots at low pressures.
Compounds
# Formula Name
1 C15H21CoO6 cobalt tris(acetylacetonate)
2 C15H21CrO6 tris(2,4-pentanedionato)chromium
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
  • Mole fraction - 1 ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Crystal - 1
  • Density calibration data
  • 33
  • POMD
  • 3
  • 2
  • Mole fraction - 2 ; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Crystal - 2
  • Density calibration data
  • 38