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

Ionic Liquids-Based Aqueous Biphasic Systems with Citrate Biodegradable Salts

Gomez, Elena, Dominguez, Irene, Dominguez, Angeles, Macedo, Eugenia A.
J. Chem. Eng. Data 2018, 63, 4, 1103-1108
ABSTRACT
New ionic liquids- aqueous biphasic systems (ABS) containing the imidazolium and pyrrolodinium cation combined with dicyanamide anion and citrate organic salts are investigated. Several ionic liquids (five in total) were evaluated towards their capacity to create aqueous biphasic systems in the presence of two low environmental impact organic salts: potassium and sodium citrate. The capacity of these ILs to form two liquid phases is discussed regarding the alkyl chain length and the cation core of the IL. Besides, the effect of the citrate salt on the phase behaviour has been also addressed. To study the capacity of the ABS, the binodal curves, the tie-lines and respective tie-line lengths were determined at T = 298.15 K and atmospheric pressure, and the tie-lines were correlated using Othmer-Tobias and Bancroft equations. Finally, a comparison between the experimental results obtained here and literature values was carried out. ACS Paragon Plus Environment
Compounds
# Formula Name
1 C8H11N5 1-ethyl-3-methylimidazolium dicyanamide
2 C6H5Na3O7 trisodium citrate
3 H2O water
4 C9H13N5 1-methyl-3-propylimidazolium dicyanamide
5 C10H15N5 1-butyl-3-methylimidazolium dicyanamide
6 C12H19N5 1-hexyl-3-methylimidazolium dicyanamide
7 C11H20N4 1-butyl-1-methylpyrrolidinium dicyanamide
8 C6H5K3O7 potassium citrate
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
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 30
  • POMD
  • 4
  • 2
  • 3
  • 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
  • 33
  • POMD
  • 5
  • 2
  • 3
  • 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
  • 66
  • POMD
  • 6
  • 2
  • 3
  • 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
  • 23
  • POMD
  • 7
  • 2
  • 3
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 7; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 48
  • POMD
  • 1
  • 8
  • 3
  • Mass fraction - 8 ; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 54
  • POMD
  • 4
  • 8
  • 3
  • Mass fraction - 8 ; 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
  • 54
  • POMD
  • 5
  • 8
  • 3
  • Mass fraction - 8 ; 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
  • 51
  • POMD
  • 6
  • 8
  • 3
  • Mass fraction - 8 ; 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
  • 48
  • POMD
  • 7
  • 8
  • 3
  • Mass fraction - 8 ; Liquid mixture 1
  • Mass fraction - 7; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 42