Modelling liquid–liquid equilibria for island type ternary systems

Closed miscibility gaps in ternary liquid mixtures, at constant temperature and pressure, are obtained if phase separations occur only in the ternary region, whilst all binary mixtures involved in the system are completely miscible. This type of behaviour, although not very frequent, has been observ...

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Bibliographic Details
Published in:Fluid phase equilibria 2008-03, Vol.265 (1), p.184-191
Main Authors: Olaya, M.M., Reyes-Labarta, J.A., Velasco, R., Ibarra, I., Marcilla, A.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Gibbs energy of mixing
Gibbs stability test
Island miscibility gaps
Liquid-liquid equilibria
LLE
NRTL
Phase equilibria
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Summary:Closed miscibility gaps in ternary liquid mixtures, at constant temperature and pressure, are obtained if phase separations occur only in the ternary region, whilst all binary mixtures involved in the system are completely miscible. This type of behaviour, although not very frequent, has been observed for a certain number of systems. Nevertheless, we have found no information about the applicability of the common activity coefficient models, as NRTL and UNIQUAC, for these types of ternary systems. Moreover, any of the island type systems published in the most common liquid–liquid equilibrium data collections, are correlated with any model. In this paper, the applicability of the NRTL equation to model the LLE of island type systems is assessed using topological concepts related to the Gibbs stability test. A first attempt to correlate experimental LLE data for two island type ternary systems is also presented.
ISSN:0378-3812
1879-0224
DOI:10.1016/j.fluid.2007.12.010