Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Phase behaviour at different temperatures of an aqueous two-phase ionic liquid containing ([Bmim]BF4 + manganese sulfate + water)

Alvarenga, B. G.[Bruno Giordano], Virtuoso, L. S.[Luciano Sindra], Lemes, N. H. T.[Nelson Henrique Teixeira], Luccas, P. O.[Pedro Orival]
J. Chem. Thermodyn. 2013, 61, 45-50
ABSTRACT
The phase diagrams and liquid + liquid equilibrium (LLE) data of the 1-butyl-3-methylimidazolium tetra-fluoroborate {([Bmim]BF4 ) + Manganese sulfate (MnSO4 ) + water} system have been determined experimentally at T = (288.15, 293.15, 298.15, 303.15 and 308.15) K. As the temperature decreases, this aqueous two-phase system exhibits a phase inversion. Specifically, the [Bmim]BF4-rich phases are the less dense top phases at high temperatures but become the bottom phase at elevated temperatures. The effect depends on the concentration of both the [Bmim]BF4 and MnSO4 . At temperatures of (293.15 and 303.15) K, inversion occurs for the system only at higher concentrations of either phase-forming constituent. In addition, as the temperature increases the inversion-phase region expands. The binodal curves are fitted to an empirical non-linear expression developed by Merchuk, and the salting-out effect at various temperatures was studied quantitatively using the Setschenow equation
Compounds
# Formula Name
1 C8H15BF4N2 1-butyl-3-methylimidazolium tetrafluoroborate
2 MnO4S manganese(II) sulfate
3 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
  • 3
  • 2
  • 1
  • Mass fraction - 2 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Cloud Point
  • 150
  • POMD
  • 3
  • 2
  • 1
  • Mass fraction - 2 ; Liquid mixture 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 1 ; 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
  • Combination AA and UV-VIS spectroscopy
  • Combination AA and UV-VIS spectroscopy
  • Combination AA and UV-VIS spectroscopy
  • 25