Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Measurement and prediction of the solubilities of aromatic polyimide monomers in supercritical carbon dioxide with acetone

Haruki, M.[Masashi], Fukui, N.[Naoya], Kihara, S.-i.[Shin-ichi], Takishima, S.[Shigeki]
J. Chem. Thermodyn. 2012, 54, 261-265
ABSTRACT
The solubilities of 4,40-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA), which are the representative monomers for an aromatic polyimide, were measured in supercritical carbon dioxide (scCO2) using the semi-batch flow method to clarify the entrainer effect of acetone. The investigations were carried out at 323 K and 20.0 MPa with concentrations of acetone as high as approximately 20 mol%. Although the solubilities of both ODA and PMDA increased with increasing acetone concentrations, the entrainer effects of acetone on both monomer solubilities in scCO2 were lower than those of N,N-dimethylformamide, which was investigated in previous work. However, the addition of about 10 mol% of acetone increased the solubilities of ODA and PMDA by approximately 10- and 20-fold, respectively, compared with their solubilities in pure scCO2. Moreover, the solubilities were predicted using the Peng-Robinson equation of state.
Compounds
# Formula Name
1 C12H12N2O 4,4'-diaminodiphenyl ether
2 C10H2O6 1,2,4,5-benzenetetracarboxylic 1,2:4,5-dianhydride
3 C3H6O acetone
4 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
  • 4
  • Mole fraction - 1 ; Fluid (supercritical or subcritical phases)
  • Solvent: Mole fraction - 3; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Crystal - 1
  • UV vis-spectrometer
  • 4
  • POMD
  • 3
  • 2
  • 4
  • Mole fraction - 2 ; Fluid (supercritical or subcritical phases)
  • Solvent: Mole fraction - 3; Fluid (supercritical or subcritical phases)
  • Pressure, kPa; Fluid (supercritical or subcritical phases)
  • Temperature, K; Fluid (supercritical or subcritical phases)
  • Fluid (supercritical or subcritical phases)
  • Crystal - 2
  • UV vis-spectrometer
  • 4