UNIFAC modeling of cosolvent phase partitioning in nonaqueous phase liquid-water systems

Kenneth Y. Lee, Catherine Anne Peters

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

In this study, an existing thermodynamic model was used to predict equilibrium phase partitioning behavior of a cosolvent in a two-phase nonaqueous phase liquid (NAPL)-water system. The activity coefficients are calculated using the universal quasichemical functional group activity coefficient (UNIFAC) method. We examined an assortment of cosolvent-NAPL pairs of environmental interest and computed the UNIFAC-predicted ternary phase diagrams against published experimentally derived ternary phase diagrams. Results show that the UNIFAC model is a promising method for predicting equilibrium cosolvent partitioning behavior in NAPL-water systems, and thus can be useful in estimating the potential for NAPL solubilization and mobilization in remediation processes. The cosolvent partitioning behavior is interpreted with regard to changes in the physical properties of the NAPL-water system. Changes in interfacial tension between the two phases were estimated using an existing correlation. A viscosity experiment was conducted for selected mixtures of ethanol, toluene, and water; and the viscosity was found to increase with increasing amounts of the cosolvent.

Original languageEnglish (US)
Pages (from-to)478-483
Number of pages6
JournalJournal of Environmental Engineering
Volume130
Issue number4
DOIs
StatePublished - Apr 1 2004

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Civil and Structural Engineering
  • Environmental Chemistry
  • Environmental Science(all)

Keywords

  • Ground-water pollution
  • Nonaqueous phase liquids
  • Remedial action
  • Thermodynamics
  • Viscosity

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