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A new Pitzer parameterization for the binary NaOH-H2O and ternary NaOH-NaCl-H2O and NaOH-LiOH-H2O systems up to NaOH solid salt saturation, from 273.15 to 523.15 K and at saturated vapour pressure

Identifieur interne : 000023 ( Main/Exploration ); précédent : 000022; suivant : 000024

A new Pitzer parameterization for the binary NaOH-H2O and ternary NaOH-NaCl-H2O and NaOH-LiOH-H2O systems up to NaOH solid salt saturation, from 273.15 to 523.15 K and at saturated vapour pressure

Auteurs : Adeline Lach [France] ; Laurent Andre [France] ; Arnault Lassin [France] ; Mohamed Azaroual [France] ; Jean-Paul Serin [France] ; Pierre Cézac [France]

Source :

RBID : Hal:hal-01315435

Abstract

This paper presents a new set of Pitzer specific interaction parameters for the binary NaOH-H2O system for concentrations up to more than 30 mol·kgw-1 and temperatures ranging from 273.15 K to 523.15 K. Assuming that the electrolyte is only partially dissociated, the model requires the adjustment of i) the three classical binary interaction parameters β(0), β(1) and C, ii) the equilibrium constant of formation of the aqueous complex NaOH0(aq), and iii) one binary (λNaOH/NaOH) and one ternary (ζNaOH/Na+/OH-) interaction parameters. This approach, which provides much better results than the approach of fully dissociated electrolyte, was chosen to extend the description of the system to high temperatures and high concentrations. The temperature functions of the solubility products of anhydrous NaOH(cr) and five hydrated salts, NaOHnH2O(cr) (where n = 1, 2, 3.11, 3.5, 4), were determined. In order to evaluate the quality of the new set of parameters, several tests were run on various properties using various literature data. These include the boiling point elevation in the NaOH-H2O system and the phase diagrams of the two ternary systems NaOH-NaCl-H2O and NaOH-LiOH-H2O. Interaction parameters for the two related binary systems NaCl-H2O and LiOH-H2O were taken from previous studies. To ensure consistency, four new mixing parameters were revised (ζNa+/Cl-/NaOH and ΨCl-/OH-/Na+ for the ternary system NaOH-NaCl-H2O and λLi+/NaOH and ΨOH-/Na+/Li+ for the ternary system NaOH-LiOH-H2O). Consistent with Pitzer’s equations, our new set of parameters can be used to satisfactorily describe the quaternary Na+-Li+-Cl–-OH–-H2O system to very high concentrations and temperatures.

Url:
DOI: 10.​1007/​s10953-015-0357-6


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<div type="abstract" xml:lang="en">This paper presents a new set of Pitzer specific interaction parameters for the binary NaOH-H2O system for concentrations up to more than 30 mol·kgw-1 and temperatures ranging from 273.15 K to 523.15 K. Assuming that the electrolyte is only partially dissociated, the model requires the adjustment of i) the three classical binary interaction parameters β(0), β(1) and C, ii) the equilibrium constant of formation of the aqueous complex NaOH0(aq), and iii) one binary (λNaOH/NaOH) and one ternary (ζNaOH/Na+/OH-) interaction parameters. This approach, which provides much better results than the approach of fully dissociated electrolyte, was chosen to extend the description of the system to high temperatures and high concentrations. The temperature functions of the solubility products of anhydrous NaOH(cr) and five hydrated salts, NaOHnH2O(cr) (where n = 1, 2, 3.11, 3.5, 4), were determined. In order to evaluate the quality of the new set of parameters, several tests were run on various properties using various literature data. These include the boiling point elevation in the NaOH-H2O system and the phase diagrams of the two ternary systems NaOH-NaCl-H2O and NaOH-LiOH-H2O. Interaction parameters for the two related binary systems NaCl-H2O and LiOH-H2O were taken from previous studies. To ensure consistency, four new mixing parameters were revised (ζNa+/Cl-/NaOH and ΨCl-/OH-/Na+ for the ternary system NaOH-NaCl-H2O and λLi+/NaOH and ΨOH-/Na+/Li+ for the ternary system NaOH-LiOH-H2O). Consistent with Pitzer’s equations, our new set of parameters can be used to satisfactorily describe the quaternary Na+-Li+-Cl–-OH–-H2O system to very high concentrations and temperatures. </div>
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