Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Study of the pseudo-ternary aqueous two-phase systems of deep eutectic solvent (choline chloride:sugars) + K2HPO4 + water

Farias, F. O.[Fabiane Oliveira], Sosa, F. H. B.[Filipe Hobi Bordon], Igarashi-Mafra, L.[Luciana], Coutinho, J. A. P.[Joao Araujo Pereira], Mafra, M. R.[Marcos Rogerio]
Fluid Phase Equilib. 2017, 448, 143-151
ABSTRACT
Deep eutectic solvents (DES) are a new type of solvents that share some characteristics with ionic liquids while being cheaper, easier to prepare and, in the cases here studied, more readily biodegradable. This work reports a study on the Liquid-liquid Equilibria (LLE) of aqueous two-phase systems composed by DES + K2HPO4 + water at 298.15 K. Various DES using choline chloride as hydrogen bond acceptor (HBA), and sugars as hydrogen bond donor (HBD), were prepared at several different proportions. An approach based on thermogravimetric analysis is here proposed to quantify the phase's components. The results show that the hydrogen bonds of DES are disrupted in aqueous solutions, leading to a differential partition of the HBA and HBD between the two phases, and to be coherent a quaternary ATPS must be considered. The NRTL model was used to describe the experimental LLE data with a low mean deviation. These systems were applied to Gallic Acid partition showing good extraction levels
Compounds
# Formula Name
1 C5H14ClNO choline chloride
2 HK2O4P dipotassium hydrogen phosphate
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
  • 1
  • 3
  • 2
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 33
  • POMD
  • 1
  • 3
  • 2
  • Mass density, kg/m3 ; Liquid
  • Mass fraction - 2; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 12
  • POMD
  • 1
  • 3
  • 2
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 2 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 2; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • gravimetric method + binodal data
  • gravimetric method + binodal data
  • gravimetric method + binodal data
  • 6