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

Partitioning of DNP-Amino Acids in New Biodegradable Choline Amino Acid/Ionic Liquid-Based Aqueous Two-Phase Systems

Requejo, P. F.[Patricia F.], Gomez, E.[Elena], Macedo, E. A.[Eugenia A.]
J. Chem. Eng. Data 2019, 64, 11, 4733-4740
ABSTRACT
In this work, the partitioning of four N-(2,4-dinitrophenyl)-amino acids (DNP-L-leucine, DNP-Lvaline, DNP-L-alanine and DNP-glycine) in aqueous two-phase systems (ATPS) containing a new biodegradable ionic liquid cholinium alaninate, [Ch][Ala], and the inorganic salts, K3PO4 and K2HPO4, was determined at T = 298.15 K and at p = 101.3 kPa. The influence of the salt on the partition coefficients was discussed. The distribution coefficients (K) of the four studied DNP-amino acids studied are higher in the ATPS containing the inorganic salt K3PO4. Moreover, the experimental LLE data obtained for both ATPS {[Ch][Ala] (1) + K3PO4 or K2HPO4 (2) + water (3)} (previously reported) were represented correlated using the NRTL (NonRandom Two-Liquid) thermodynamic model.
Compounds
# Formula Name
1 C8H20N2O3 2-hydroxy-N,N,N-trimethylethanaminium L-alaninate
2 K3O4P tripotassium phosphate
3 HK2O4P dipotassium hydrogen phosphate
4 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
  • 2
  • 4
  • 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 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • OTHER
  • OTHER
  • OTHER
  • 2
  • POMD
  • 1
  • 3
  • 4
  • Mass fraction - 1 ; Liquid mixture 1
  • Mass fraction - 3 ; Liquid mixture 2
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 3; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 1
  • Liquid mixture 2
  • OTHER
  • OTHER
  • OTHER
  • 2