Generalized electrolyte-NRTL model for mixed-solvent electrolyte systems

Chau Chyun Chen, Yuhua Song

Research output: Contribution to journalArticlepeer-review

201 Scopus citations


A generalized electrolyte Non-Random Two-Liquid (eNRTL) model proposed by Chen and coworkers is presented as a comprehensive excess Gibbs energy expression to represent the liquid-phase nonideality for aqueous and mixed-solvent electrolyte systems over the entire concentration range from pure solvents to saturated solutions or fused salts. The eNRTL model is used to correlate mean ionic activity coefficients of mixed-solvent electrolyte systems. The segment interaction concept provides the framework necessary to represent the attractive interaction of ions with the hydrophilic segments of organic solvents and the repulsive interaction of ions with the hydrophobic segments of organic solvents. The ability to explicitly account for such distinctly different ion-segment interactions is shown to be the key for quantitative correlation of mean ionic activity coefficients in mixed-solvent electrolyte systems.

Original languageEnglish
Pages (from-to)1928-1941
Number of pages14
JournalAIChE Journal
Issue number8
StatePublished - Aug 2004


  • Electrolyte thermodynamics
  • Excess Gibbs energy
  • Mean ionic activity coefficients
  • Mixed solvents
  • NRTL


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