A reliable procedure to predict salt precipitation in pure phases

P. S.O. Beltrão, M. J.E.M. Cardoso, M. Castier

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This article proposes a new procedure to compute solid-liquid equilibrium in electrolyte systems that may form pure solid phases at a given temperature, pressure, and global composition. The procedure combines three sub-procedures: phase stability test, minimization of the Gibbs free energy with a stoichiometric formulation of the salt-forming reactions to compute phase splitting, and a phase elimination test. After the phase splitting calculation for a system configuration that has a certain number of phases, the phase stability test establishes whether including an additional phase will reduce the Gibbs free energy further. The criteria used for phase stability may lead, in some cases, to the premature inclusion of phases that should be absent from the final solution but, if this happens, the phase elimination sub-procedure removes them. It is possible to use the procedure with several excess Gibbs free energy models for liquid phase behavior. The procedure has proven to be reliable and fast and the results are in good agreement with literature data.

Original languageEnglish
Pages (from-to)195-208
Number of pages14
JournalBrazilian Journal of Chemical Engineering
Volume27
Issue number1
DOIs
Publication statusPublished - 1 Jan 2010

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Keywords

  • Aqueous solutions
  • Equilibrium
  • Precipitation
  • Solubility
  • Thermodynamics

ASJC Scopus subject areas

  • Chemical Engineering(all)

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