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

Liquid-Liquid-Solid Equilibria in the Ternary System Water-Phosphoric Acid-Cyclohexane at 25 and 35 deg.C: Stability Domain of Hemihydrate and Anhydrous Phosphoric Acid

Bakher, Z., Kaddami, M.
J. Chem. Eng. Data 2019, 64, 1, 161-168
ABSTRACT
The Water-Phosphoric acid-Cyclohexane ternary system was studied at 25 and 35C under atmospheric pressure, and the binodal curve was determined by cloud-point method. In addition, the isoplethic section between 2H3PO4.H2O-Cyclohexane was investigated using a Tammann diagram based on the thermal analysis of different samples with the determination of hemihydrate melting temperature. The concentration of phosphoric acid and cyclohexane were assayed by volumetric titration and gas chromatography respectively, the amount of water was calculated by the material balance equation. The miscibility between phosphoric acid and cyclohexane was founded very low with the appearance of three-phase stability domain (LLS) by the presence of phosphoric acid crystals: hemihydrate (2H3PO4.H2O) and anhydrous phosphoric acid (H3PO4).
Compounds
# Formula Name
1 H2O water
2 C6H12 cyclohexane
3 H3O4P phosphoric acid
4 H8O9P2 phosphoric acid hemihydrate
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
  • 2
  • Normal melting temperature, K ; Crystal
  • Crystal
  • Liquid
  • Air at 1 atmosphere
  • Heating/Cooling curves
  • 1
  • POMD
  • 4
  • Normal melting temperature, K ; Crystal
  • Crystal
  • Liquid
  • Air at 1 atmosphere
  • Heating/Cooling curves
  • 1
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Mass fraction - 1; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Titration method
  • 43
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Mass fraction - 1; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Titration method
  • 10
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 3
  • Mass fraction - 1; Liquid mixture 3
  • Temperature, K; Liquid mixture 3
  • Pressure, kPa; Liquid mixture 3
  • Liquid mixture 3
  • Liquid mixture 2
  • Titration method
  • 2
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Crystal of intercomponent compound 1
  • Liquid mixture 2
  • Titration method
  • 1
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 3
  • Temperature, K; Liquid mixture 3
  • Pressure, kPa; Liquid mixture 3
  • Liquid mixture 3
  • Crystal of intercomponent compound 1
  • Liquid mixture 2
  • Titration method
  • 1
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 3 ; Liquid mixture 3
  • Temperature, K; Liquid mixture 3
  • Pressure, kPa; Liquid mixture 3
  • Liquid mixture 3
  • Crystal - 3
  • Liquid mixture 2
  • Titration method
  • 2
  • POMD
  • 1
  • 2
  • 3
  • 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
  • OTHER
  • OTHER
  • OTHER
  • 8