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

Solid-Liquid Equilibrium of Quinary Aqueous Solution Composed of Lithium, Potassium, Rubidium, Magnesium, and Borate at 323.15 K

Yu, X.[Xudong], Zheng, M.[Mianping], Zeng, Y.[Ying], Wang, L.[Lin]
J. Chem. Eng. Data 2019, 64, 12, 5681-5687
ABSTRACT
To understand the thermodynamic behaviors of the borate containing system, the solid-liquid equilibrium data (solubilities, density, and refractive index) of quinary aqueous solution composed of lithium, potassium, rubidium, magnesium, and borate at 323.15 K were determined by using the isothermal dissolution method. The crystalloid forms of the solid phase were confirmed by the X-ray diffraction method. Results show that four single salts Li2B4O7*3H2O, K2B4O7*4H2O, RbB5O8*4H2O, and MgB4O7*9H2O formed at 323.15 K in the quinary invariant point, no double salt or solid solution was found. Under the condition of Li2B4O7 saturation, the crystallization region of MgB4O7*9H2O occupied the largest crystallization region, and salt K2B4O7*4H2O had the smallest region. Among the four salts, the salts MgB4O7*9H2O and RbB5O8*4H2O crystalline regions changed obviously at 323.15 and 348.15 K, the crystalline region of MgB4O7*9H2O enlarged at 323.15 K, and that of RbB5O8*4H2O and K2B4O7*4H2O decreased.
Compounds
# Formula Name
1 B4Li2O7 lithium borate
2 B4K2O7 potassium tetraborate
3 B4MgO7 magnesium tetraborate
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
  • 2
  • 3
  • 4
  • Mass fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 1
  • Titration method
  • 1
  • POMD
  • 2
  • 3
  • 4
  • Mass fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 2
  • Titration method
  • 1
  • POMD
  • 1
  • 3
  • 4
  • Mass fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 2
  • Titration method
  • 1
  • POMD
  • 1
  • 3
  • 4
  • Mass fraction - 3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 1
  • Titration method
  • 1