Thermodynamics Research Center, ThermoML : Journal of Chemical and Engineering Data

Experimental Data and Thermodynamic Model in the Salt-Water Ternary System (NaBO2 + Na2B4O7 + H2O) at T = 298.15 K and p = 0.1 MPa

Chen, L.[Lele], Li, D.[Dan], Guo, Y.[Yafei], Deng, T.[Tianlong], Meng, L.[Lingzong]
J. Chem. Eng. Data 2019, 64, 12, 5878-5885
ABSTRACT
Solubilities, refractive indices, densities and pH for the ternary system (NaBO2 + Na2B4O7 + H2O) at 298.15 K were measured by the dissolution equilibrium method. The phase diagram of the ternary system was established and calculated. In the phase diagram of the ternary system of (NaBO2 + Na2B4O7 + H2O), there are one invariant point, two crystallization regions corresponding to the sodium metaborate tetrahydrate (NaBO2*4H2O) and borax (Na2B4O7*10H2O). The solubility calculation of the ternary system was carried out with three models on the basis of Pitzer and Harvie-Weare (HW) model. The first model (model I) is to assume that there is only two boron ions B(OH)4- and B4O5(OH)42- in the solution. The second model (model II) is to assume that there are four forms for boron corresponding to B(OH)3, B(OH)4-, B3O3(OH)4- and B4O5(OH)42- in the solution. The third model was extended from model II with adding OH- in the solution. The calculated pH data for the solution with model III are in accordance with the experimental values. The results show that model III are more reliable. The results of solubility calculation for the system containing borate in this study are essential for the development of universal thermodynamic models for brine systems containing borate.
Compounds
# Formula Name
1 BNaO2 sodium metaborate
2 B4Na2O7 sodium tetraborate
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
  • 2
  • 3
  • Mass fraction - 2 ; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 1
  • Titration method
  • 3
  • POMD
  • 1
  • 2
  • 3
  • Mass fraction - 2 ; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 2
  • Titration method
  • 7
  • POMD
  • 1
  • 2
  • 3
  • Mass density, kg/m3 ; Liquid
  • Mass fraction - 1; Liquid
  • Mass fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 9
  • POMD
  • 1
  • 2
  • 3
  • Refractive index (Na D-line) ; Liquid
  • Mass fraction - 1; Liquid
  • Mass fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Standard Abbe refractometry
  • 9
  • POMD
  • 1
  • 3
  • Mass fraction - 1 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 1
  • Titration method
  • 1
  • POMD
  • 1
  • 3
  • Mass density, kg/m3 ; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 1
  • 3
  • Refractive index (Na D-line) ; Liquid
  • Mass fraction - 1; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Standard Abbe refractometry
  • 1
  • POMD
  • 2
  • 3
  • Mass fraction - 2 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 2
  • Titration method
  • 1
  • POMD
  • 2
  • 3
  • Mass density, kg/m3 ; Liquid
  • Mass fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 2
  • 3
  • Refractive index (Na D-line) ; Liquid
  • Mass fraction - 2; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Standard Abbe refractometry
  • 1