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1 Polish Journal of Chemistry

1 2006

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Modeling of the Liquid-Liquid Equilibrium for Aqueous Solutions of Nonionic Surfactants CiEj

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Browarzik C. , Browarzik D.

2006

tom Vol. 80, nr 1

117-128

A new thermodynamic model was developed to calculate the liquid-liquid equilibria (LLE) of aqueous solutions of nonionic surfactants. It is based on continuous thermodynamics and on Flory-Huggins theory. Besides the micellization the self association ofwater is taken into account in the framework of a mass-action law approach. The polydisperse mixture of micelles and water associates is described by two continuous size distribution functions depending on temperature and surfactant concentration. First, the model is applied to several aqueous solutions of n-alkyl polyglycol ethers (CiEj) with tail length i from 6 to 8 and head length j from 3 to 6, showing lower critical solution temperatures (LCST) only. Furthermore, LLE was calculated for the aqueous solutions of C4E1, C10E4 and C10E5 with closed-loop miscibility gaps. The agreement between calculated and experimental data is very good for nearly all systems of both types.