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

Liquid-Liquid Phase Equilibria of (Ethanol or Methanol + Water) Containing either Dipotassium Hydrogen Phosphate or Sodium Dihydrogen Phosphate

Katayama, H.[Hirotake], Miyahara, M.[Masahito]
J. Chem. Eng. Data 2006, 51, 3, 914-918
ABSTRACT
Liquid-liquid equilibria (LLE) for (ethanol + water + K2HPO4), (ethanol + water + NaH2PO4), and (methanol + water + K2HPO4) were measured at temperatures of (288.15, 298.15, and 308.15) K. A nonlinear equation was used to describe the binodal curves, in terms of the mass fraction of phosphate versus that of ethanol, and the tie lines were successfully correlated with the Othmer-Tobias and Bancroft equations. LLE results were predicted using the binodal and Othmer-Tobias equations as well as by the binodal and Bancroft equations. Both predictions showed close agreement with experimental values, and the average deviations of the former pair of equations were 0.41, 0.24, and 0.19 for (ethanol +water + K2HPO4), (ethanol + water + NaH2PO4), and (methanol + water + K2HPO4), respectively.
Compounds
# Formula Name
1 C2H6O ethanol
2 H2O water
3 HK2O4P dipotassium hydrogen phosphate
4 H2NaO4P sodium dihydrogen phosphate
5 CH4O methanol
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 - 1 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 3; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • CHROM:UFactor:4
  • CHROM:UFactor:4
  • CHROM:UFactor:4
  • 26
  • POMD
  • 1
  • 4
  • 2
  • Mass fraction - 1 ; Liquid mixture 2
  • Mass fraction - 4 ; Liquid mixture 1
  • Mass fraction - 1 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 4; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • 19
  • POMD
  • 5
  • 2
  • 3
  • Mass fraction - 5 ; Liquid mixture 2
  • Mass fraction - 3 ; Liquid mixture 1
  • Mass fraction - 5 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 3; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 2
  • Liquid mixture 1
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • CHROM:UFactor:8
  • 26