Thermodynamic model of aqueous Mg2+ – Na+ – K+ – Cl quaternary system

Sheik Tanveer, Huan Zhou, Chau Chyun Chen

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Abstract

We present a thermodynamic model for the aqueous Mg2+ – Na+ – K+ – Cl quaternary system based on symmetric electrolyte Non-Random Two Liquid (eNRTL) theory. This work is a continuation of our previous study on the aqueous Ca2+ – Na+ – K+ – Cl quaternary system and part of a larger effort to develop a comprehensive engineering thermodynamic model for high salinity produced water in oil and gas production. The eNRTL theory requires two binary interaction parameters for each molecule-molecule, molecule-electrolyte, and electrolyte-electrolyte pair to correlate composition dependence of the solution nonideality. The binary interaction parameters, including their temperature coefficients, are identified for the (Mg2+-Cl):H2O pair, (Mg2+-Cl):(K+-Cl) pair, and (Mg2+-Cl):(Na+-Cl) pair using available thermodynamic data. The binary parameters for the other pairs are taken directly from the literature. Together, the eNRTL model and the binary parameters yield a satisfactory thermodynamic model for the quaternary system and its subsystems with temperatures ranging from 273.15 to 473.15 K and salt concentrations up to saturation.

Original languageEnglish
Pages (from-to)56-68
Number of pages13
JournalFluid Phase Equilibria
Volume437
DOIs
StatePublished - Apr 15 2017

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Keywords

  • Aqueous electrolytes
  • Electrolyte NRTL model
  • Magnesium chloride
  • Solubility
  • Thermodynamic properties

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