Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Measurement and Correlation of Phase Diagram Data for Aqueous Two-Phase Systems Containing 1-Ethyl-3-methylimidazolium Dimethyl Phosphate + K3PO4/K2HPO4/K2CO3 + H2O Ionic Liquids at (298.15, 308.15, and 318.15) K

Wang, L.[Liang], Zhu, H.[Hong], Ma, C.[Chunhong], Yan, Y.[Yongsheng], Wang, Q.[Qingwei]
J. Chem. Eng. Data 2012, 57, 3, 681-687
ABSTRACT
Binodal data for the 1-ethyl-3-methylimidazolium dimethyl phosphate ([Emim]DMP) + salt (K3PO4, K2HPO4, and K2CO3) + H2O systems were experimentally determined at T = (298.15, 308.15, and 318.15) K, respectively. The Merchuk equation was used to correlate the binodal data. The abilities of the different salts for phase separation follow the order K3PO4 greater than K2HPO4 greater than K2CO3, which may be related to the Gibbs free energy of hydration of the ions (?hydG). The two-phase area expands with a decrease in temperature, whereas the slope of the tie lines slightly decreases with an increase in temperature. The reliability of the calculation method and corresponding tie-line data was described by the Othmer Tobias and Bancroft equations, as well as the two-parameter equation. [Emim]DMP is a familiar ionic liquid, extensively used for the extractive desulfurization of fuel oils. This study is the first to report data on the phase diagrams of [Emim]DMP + salt + water systems.
Compounds
# Formula Name
1 C8H17N2O4P 1-ethyl-3-methylimidazolium dimethylphosphate
2 CK2O3 potassium carbonate
3 HK2O4P dipotassium hydrogen phosphate
4 K3O4P tripotassium phosphate
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
  • 5
  • 4
  • 1
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 4 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 4; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Titration method
  • Titration method
  • Titration method
  • 9
  • POMD
  • 5
  • 4
  • 1
  • 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
  • 88
  • POMD
  • 5
  • 3
  • 1
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 3 ; 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
  • Titration method
  • Titration method
  • Titration method
  • 9
  • POMD
  • 5
  • 3
  • 1
  • 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
  • 95
  • POMD
  • 2
  • 5
  • 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
  • Titration method
  • Titration method
  • Titration method
  • 9
  • POMD
  • 2
  • 5
  • 1
  • 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
  • 88