## Abstract

A comprehensive thermodynamic model based on the electrolyte NRTL (eNRTL) activity coefficient equation is developed for the NaCl+H_{2}O binary, the Na_{2}SO_{4}+H_{2}O binary and the NaCl+Na_{2}SO_{4}+H_{2}O ternary. The NRTL binary parameters for pairs H_{2}O-(Na^{+}, Cl^{-}) and H_{2}O-(Na^{+}, SO_{4} ^{2-}), and the aqueous phase infinite dilution heat capacity parameters for ions Cl^{-} and SO_{4} ^{2-} are regressed from fitting experimental data on mean ionic activity coefficient, heat capacity, liquid enthalpy and dissolution enthalpy for the NaCl+H_{2}O binary and the Na_{2}SO_{4}+H_{2}O binary with electrolyte concentrations up to saturation and temperature up to 473.15K. The Gibbs energy of formation, enthalpy of formation and heat capacity parameters for solids NaCl_{(s)}, NaCl·2H_{2}O_{(s)}, Na_{2}SO_{4(s)} and Na_{2}SO_{4}·10H_{2}O_{(s)} are obtained by fitting experimental data on solubilities of NaCl and Na_{2}SO_{4} in water. The NRTL binary parameters for the (Na^{+}, Cl^{-})-(Na^{+}, SO_{4} ^{2-}) pair are regressed from fitting experimental data on dissolution enthalpies and solubilities for the NaCl+Na_{2}SO_{4}+H_{2}O ternary.

Original language | English |
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Pages (from-to) | 149-161 |

Number of pages | 13 |

Journal | Fluid Phase Equilibria |

Volume | 306 |

Issue number | 2 |

DOIs | |

State | Published - Jul 25 2011 |

## Keywords

- Electrolyte NRTL model
- Liquid-solid equilibrium
- Sodium chloride
- Sodium sulfate
- Vapor-liquid equilibrium

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