Journal
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
Volume 227, Issue 2-3, Pages 269-284Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2013.0329
Keywords
Interfacial Tension; Liquid-Liquid-Equilibrium; Ternary System; Interfacial Concentration Profiles
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The interfacial tension between demixed liquids has a large impact on the mass transfer over the phase boundary. In this paper a special version of the density-gradient theory for ternary systems, where the grand thermodynamic potential is calculated using the Koningsveld-Kleintjens model, is suggested. This approach allows the prediction of the interfacial tensions of practical important ternary systems based on information of the binary subsystems In order to verify this idea two ternary systems showing only one miscibility gap, namely water + butan-1-ol + ethanol and water + acetone + toluene, were selected. The predicted interfacial tensions were very close to the experimental data taken from the literature and to own experimental data obtained by spinning drop measurements. Both systems differ in the enrichment behavior. Whereas ethanol will be enriched in the interface to a small amount, the enrichment of acetone is much more pronounced.
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