Gibbs energy based procedure for the correlation of type 3 ternary systems including a three-liquid phase region

Equilibrium data for type 3 ternary systems comprising a liquid–liquid–liquid equilibrium region (LLLE tie-triangle) are not frequently correlated, as is evidenced by a lack of studies in the literature. In the present paper, a robust algorithm to calculate or correlate equilibrium data for this typ...

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Bibliographic Details
Published in:Fluid phase equilibria 2009-07, Vol.281 (1), p.87-95
Main Authors: Marcilla, A., Olaya, M.M., Serrano, M.D., Velasco, R., Reyes-Labarta, J.A.
Format: Article
Language:English
Subjects:
Chemistry
Data correlation
Exact sciences and technology
General and physical chemistry
Liquid-liquid equilibria
LLE
LLLE
NRTL
Phase equilibria
Tie-triangle
Type 3 systems
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Summary:Equilibrium data for type 3 ternary systems comprising a liquid–liquid–liquid equilibrium region (LLLE tie-triangle) are not frequently correlated, as is evidenced by a lack of studies in the literature. In the present paper, a robust algorithm to calculate or correlate equilibrium data for this type of system is proposed. This algorithm is based on geometric aspects related to the Gibbs energy of mixing ( g M) and possesses some interesting advantages that are discussed in the text. The methodology put forward is applied to correlate the equilibrium data of three type 3 ternary systems. The NRTL model is used to define g M, and the common tangent plane criterion to define the equilibrium condition for the calculations. The lack in flexibility of the NRTL equation to model these systems is discussed.
ISSN:0378-3812
1879-0224
DOI:10.1016/j.fluid.2009.04.005