Thermodynamics Research Center / ThermoML | Thermochimica Acta

Liquid-liquid equilibrium composed of imidazolium tetrafluoroborate ionic liquids + sodium carbonate aqueous two-phase systems and correlation at (288.15, 298.15, and 308.15) K

Yu, C.[Cuilan], Han, J.[Juan], Wang, Y.[Yun], Yan, Y.[Yongsheng], Hu, S.[Shiping], Li, Y.[Yanfang], Zhao, X.[Xiaohong]
Thermochim. Acta 2011, 523, 1-2, 221-6
ABSTRACT
Binodal curves of 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4) + sodium carbonate and 1-propyl-3-methylimidazolium tetrafluoroborate ([Pmim]BF4) + sodium carbonate systems have been determined experimentally at T = (288.15, 298.15, and 308.15) K, respectively. An empirical nonlinear expression which has four fitting parameters was used to reproduce experimental binodal data. The tie-line data were successfully correlated by the Othmer-Tobias and Bancroft and two-parameter equations. Good agreement was obtained with the experimental tie-line data with both models. Factors affecting the binodal curves such as temperature and nature of ionic liquids were also studied. It was demonstrated that two-phase area was expanded with a decrease in temperature, while the absolute value of slope of the ties slightly decreases with an increase in temperature. However, the binodal curves became more close to the origin with an increase in alkyl chain length of the ionic liquids (ILs) on the investigated systems.
Compounds
# Formula Name
1 CNa2O3 sodium carbonate
2 H2O water
3 C6H11BF4N2 1-ethyl-3-methylimidazolium tetrafluoroborate
4 C7H13BF4N2 1-propyl-3-methylimidazolium tetrafluoroborate
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
  • 1
  • 2
  • 3
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Spectrometry
  • Spectrometry
  • Spectrometry
  • 9
  • POMD
  • 1
  • 2
  • 3
  • Mole fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mole fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 100
  • POMD
  • 1
  • 2
  • 4
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 4 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • Mole fraction - 4; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Spectrometry
  • Spectrometry
  • Spectrometry
  • 9
  • POMD
  • 1
  • 2
  • 4
  • Mole fraction - 4 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mole fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 97