Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Phase diagrams of aqueous biphasic systems composed of ionic liquids and dipotassium carbonate at different temperatures

Malekghasemi, S.[Sepandar], Mokhtarani, B.[Babak], Hamzehzadeh, S.[Sholeh], Hajfarajollah, H.[Hamidreza], Sharifi, A.[Ali], Mirzaei, M.[Mojtaba]
Fluid Phase Equilib. 2016, 415, 193-202
ABSTRACT
Phase diagrams of the {1-butyl-3-methylimidazolium nitrate ([Bmim][NO3])/1-hexyl-3-methylimidazolium nitrate ([Hmim][NO3]) + dipotassium carbonate (K2CO3)} aqueous biphasic systems (ABS) and the binodal curves of {1-octyl-3-methylimidazolium nitrate ([Omim][NO3]) + K2CO3} ABS were determined experimentally at different temperatures. The binodal data were correlated with the Merchuk equation. The effect of temperature and the alkyl chain length of ionic liquid (IL) on two phase formation were investigated. The experimental data reveals the biphasic region expands with reduction in temperature; however, the absolute value of slope of the tie-lines reduces with an increase in temperature. Moreover, the ability of the studied ILs to form two phase in the presence of K2CO3 salt are in the order of [Hmim][NO3] greater than [Omim][NO3] greater than [Bmim][NO3]. The experimental data are correlated with the NRTL model with a good accuracy.
Compounds
# Formula Name
1 CK2O3 potassium carbonate
2 C8H15N3O3 1-butyl-3-methylimidazolium nitrate
3 C10H19N3O3 1-hexyl-3-methylimidazolium nitrate
4 C12H23N3O3 1-methyl-3-octylimidazolium nitrate
5 H2O water
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
  • 5
  • 2
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 306
  • POMD
  • 1
  • 5
  • 2
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • OTHER
  • OTHER
  • OTHER
  • 18
  • POMD
  • 1
  • 5
  • 3
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 304
  • POMD
  • 1
  • 5
  • 3
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • OTHER
  • OTHER
  • OTHER
  • 18
  • POMD
  • 1
  • 5
  • 4
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 303