Thermodynamic properties of aqueous solutions of single and multiple salts using the Q-electrolattice equation of state

André Zuber, Ricardo Figueiredo Checoni, Marcelo Castier

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Thermodynamic property calculations of solutions containing electrolytes are relevant to design and optimize industrial process, among which water desalination. The conventional way of designing such processes relies on specific models or correlations for vapor pressure, density, osmotic coefficient, and mean ionic activity coefficient. Nonetheless, an equation of state (EOS) for electrolyte solutions enables, in principle, the evaluation of all of them. In previous work, the electrolattice EOS was presented, being composed by three terms: the Mattedi-Tavares-Castier (MTC) lattice-based contribution, the Born contribution, and an explicit mean spherical approximation (MSA) for ions of equal diameters. In the present work, an explicit MSA term suitable for ions of unequal diameters is used instead, along with new water parameters and two adjustable parameters per ion. The new expression for the Helmholtz energy, referred to as Q-electrolattice model, is used to correlate mean ionic activity coefficients and densities in strong 78 single-salt aqueous solutions. Additionally, calculations of vapor pressure, osmotic coefficient, and apparent molar volume of salt are performed. Predictions of thermodynamic properties for aqueous solutions containing multiple salts and seawater are also presented without using any additional adjustable parameter.

Original languageEnglish
Pages (from-to)268-280
Number of pages13
JournalFluid Phase Equilibria
Volume362
DOIs
Publication statusPublished - 25 Jan 2014

Fingerprint

Equations of state
equations of state
Thermodynamic properties
thermodynamic properties
Salts
aqueous solutions
salts
Activity coefficients
Ions
coefficients
Vapor pressure
vapor pressure
Electrolytes
electrolytes
ions
Water
Desalination
approximation
Seawater
Density (specific gravity)

Keywords

  • Electrolyte
  • Equation of state
  • Lattice model
  • Salt
  • Water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Thermodynamic properties of aqueous solutions of single and multiple salts using the Q-electrolattice equation of state. / Zuber, André; Checoni, Ricardo Figueiredo; Castier, Marcelo.

In: Fluid Phase Equilibria, Vol. 362, 25.01.2014, p. 268-280.

Research output: Contribution to journalArticle

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