A thermodynamic model of aqueous electrolyte solution behavior and solid-liquid equilibrium in the Li-H-Na-K-Cl-OH-H2O system to very high concentrations (40 molal) and from 0 to 250 C

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ID: 295080
2015
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Abstract
This paper describes a chemical model that calculates solute and solvent activities and solid-liquid equilibria in the Li-H-Na-K-Cl-OH-H2O system from dilute to high solution concentration within the 0 to 250 °C temperature range. The model coherently extends to Li the temperature-variable H-Na-K-OH-Cl-H2O model of Christov and Møller (2004b, p. 1309). The solubility modeling approach based on Pitzer9s (1973, p. 268) specific interaction equations is used. All binary (LiCl-H2O and LiOH-H2O) and ternary (LiCl-HCl-H2O, LiCl-NaCl-H2O, LiCl-KCl-H2O, LiOH-NaOH-H2O, LiOH-KOH-H2O, and LiOH-LiCl-H2O) lithium subsystems are included in the model parameterization. The model for the LiCl-H2O system is parameterized using two different approaches: (1) with 4 ion interaction binary parameters (β(0), β(1), β(2), and Cϕ), and (2) with 3 ion interaction binary parameters (β(0), β(1), and Cϕ) and including neutral aqueous LiCl0(aq) species. Approach (2) provides a better fit of activity data in unsaturated binary solutions and accurately predicts solid solubilities up to 40 mol.kg−1 and up to 250 °C. Therefore, this approach was used to parameterize lithium chloride mixed systems. Temperature functions for the thermodynamic solubility product (as log Kosp) of 5 simple lithium salts (LiCl.2H2O(cr), LiCl. H2O(cr), LiCl(cr), LiOH. H2O(cr), and LiOH(cr)) are determined. The log Kosp values of 3 double lithium basic salts precipitating in the LiOH-LiCl-H2O system at 50 °C (3LiOH.LiCl(cr), LiOH.LiCl(cr), and LiOH.3LiCl(cr)) are also estimated using solubility data.
Reference Key
openalex_W2069818993 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Arnault Lassin, Christomir Christov, Laurent André, Mohamed Azaroual
Journal american journal of science
Year 2015
DOI
10.2475/03.2015.02
URL
https://doi.org/10.2475/03.2015.02
Keywords Keywords not found

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