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

Density Calculations for (Na, K)BH4 + (Na, K)BO2 + (Na, K)OH + H2O Solutions Used in Hydrogen Power Engineering

Churikov, A. V.[Alexei V.], Ivanishchev, A. V.[Alexander V.], Gamayunova, I. M.[Irina M.], Ushakov, A.[Arseni]
J. Chem. Eng. Data 2011, 56, 11, 3984-3993
ABSTRACT
Concentrated water alkaline mixtures of sodium and potassium borohydrides and borates are used as fuel and hydrogen sources in hydrogen power engineering, including low-temperature fuel cells. The performance of such mixtures is determined by their physicochemical properties. An algorithm to calculate the density of mixed solutions of the five-component (Na, K)BH4 + (Na, K)BO2 + (Na, K)OH + H2O system based on density quasi-additivity is proposed. The density concentration temperature dependences for aqueous KOH, NaOH, KBO2, NaBO2, NaBH4, and KBH4 solutions of any composition in a temperature range of (10 to 50) deg C and in the whole concentration range are described mathematically. The technique and algorithm of calculation have been verified by comparison with measured properties.
Compounds
# Formula Name
1 H2O water
2 BNaO2 sodium metaborate
3 BKO2 potassium metaborate
4 HNaO sodium hydroxide
5 BH4Na sodium tetrahydroborate
6 HKO potassium hydroxide
7 BH4K potassium tetrahydroborate
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
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Pycnometric method
  • 15
  • POMD
  • 1
  • 3
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 3; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Pycnometric method
  • 18
  • POMD
  • 4
  • 1
  • 5
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 5; Liquid
  • Mass fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Pycnometric method
  • 18
  • POMD
  • 6
  • 1
  • 7
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Mass fraction - 7; Liquid
  • Mass fraction - 6; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Pycnometric method
  • 15