Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

(Liquid + liquid) equilibria for (acetate-based ionic liquids + inorganic salts) aqueous two-phase systems

Li, Z.[Zhiyong], Pei, Y.[Yuanchao], Liu, L.[Li], Wang, J.[Jianji]
J. Chem. Thermodyn. 2010, 42, 7, 932-937
ABSTRACT
In the present work, (liquid + liquid) equilibrium data have been determined experimentally for aqueous two-phase systems formed by the imidazolium ionic liquids of [Cnmim][CH3COO] (n = 4, 6, 8) and inorganic salts of K3PO4, K2HPO4, and K2CO3 at T = 298.15 K. Combined with available data in the literature, the effect of alkyl chain length of cations, type of anions of the ionic liquids, and nature of the inorganic salts were examined on the binodal curves of the systems. Then the binodal curves were fitted to a four-parameter empirical equation, and the tie-lines were described by the Othmer Tobias and Bancroft equations. In addition, the extraction capacity of the {[Cnmim][CH3COO] (n = 4, 6, 8) + K3PO4} aqueous two-phase systems was evaluated through their application to the extraction of l-tryptophan. The high extraction efficiency suggests that these aqueous two-phase systems are feasible to be used in the extraction and separation process.
Compounds
# Formula Name
1 C10H18N2O2 1-butyl-3-methylimidazolium acetate
2 C12H22N2O2 3-hexyl-1-methylimidazolium acetate
3 C14H26N2O2 1-methyl-3-octylimidazolium acetate
4 K3O4P tripotassium phosphate
5 HK2O4P dipotassium hydrogen phosphate
6 CK2O3 potassium carbonate
7 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
  • 7
  • 4
  • 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 12
  • POMD
  • 7
  • 4
  • 1
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 1 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 1
  • Liquid mixture 2
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • 1
  • POMD
  • 7
  • 5
  • 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 18
  • POMD
  • 7
  • 5
  • 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 5 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • 3
  • POMD
  • 6
  • 7
  • 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 6; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 22
  • POMD
  • 7
  • 4
  • 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 17
  • POMD
  • 7
  • 4
  • 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 2 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 1
  • Liquid mixture 2
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • 1
  • POMD
  • 7
  • 5
  • 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 21
  • POMD
  • 6
  • 7
  • 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 6; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 18
  • POMD
  • 7
  • 4
  • 3
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 25
  • POMD
  • 7
  • 4
  • 3
  • Mass fraction - 4 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 3; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • UV spectroscopy and gravimetry
  • 1
  • POMD
  • 7
  • 5
  • 3
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 5; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 27
  • POMD
  • 6
  • 7
  • 3
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 6; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 24