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

Phase Diagram of HCOOK (NH2)2CO H2O System

Dzuban, A.[Alexander], Voskov, A.[Alexey], Uspenskaya, I.[Irina]
J. Chem. Eng. Data 2013, 58, 9, 2440-2448
ABSTRACT
The temperature and enthalpy of fusion and of the solid-state phase transition in HCOOK were determined by a differential scanning calorimetry (DSC) method. The thermodynamic assessment of the potassium formate urea water ternary system and of two binary subsystems was made. The Redlich Kister model was applied for the description of binary liquids. The Gibbs energy of ternary liquid was assessed by the Muggianu and Bonnier-Toop methods; both methods gave similar results. The thermodynamic properties of potassium formate hydrate were estimated from the liquidus data. The liquidus surface, isothermal and polythermal sections of the phase diagram were calculated. It was shown that the results of calculation correlated with DSC measurements of ternary mixtures.
Compounds
# Formula Name
1 CHKO2 potassium formate
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
  • Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 1
  • Triple point temperature, K ; Crystal 2
  • Crystal 2
  • Crystal 1
  • Air at 1 atmosphere
  • DTA
  • 1
  • POMD
  • 1
  • Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1
  • Crystal 1
  • Liquid
  • Air at 1 atmosphere
  • DSC
  • 1
  • POMD
  • 1
  • Normal melting temperature, K ; Crystal 1
  • Crystal 1
  • Liquid
  • Air at 1 atmosphere
  • DTA
  • 1