Mixing Rule of Sanches-Lacombe Equation of State for Prediction of Solvent Solubility in Polymer Solution

Gede Wibawa


In this work, mixing rule of Sanches-Lacombe equation of state (SL-EoS) was developed for estimating vapor-liquid equilibria of solvent-polymer systems or solubility of solvent in polymer solutions. The model was derived by matching excess Gibbs energy of Sanches-Lacombe equation of state and that of group contribution model at zero pressure. Present model can be applied to wide range of pressure. In addition, this model covers systems with various molecular interactions, since functional group interaction parameters of UNIFAC-FV and UNIFAC-ZM models have been available for various groups.


Equation of State; Mixing Rule; Solubility; Polymer and Solvent

Full Text:



Oishi, T. and J. M. Prausnitz, “Estimation of solvent activities in polymer solutions using a group contribution method”, Ind. Eng. Chem. Process Des. Dev., Vol.17, pp. 333-339. 1978.

Wibawa, G., S. Takishima, Y. Sato, H. Masuoka, “Revision of UNIFAC group interaction parameters of group contribution models to improve prediction results of vaporliquid equilibria for solvent-polymer systems”, Fluid Phase Equilib., Vol. 202, pp. 367-383. 2002.

Elbro, H. S., Aa. Fredenslund and P. Rasmussen, “A new simple equation for the prediction of solvent activities in polymer solutions”, Macromolecules, Vol. 23 , pp. 4707- 4714. 1990.

Zhong, C., Y. Sato, H. Masuoka and X. Chen, “ Improvement of predictive accuracy of the UNIFAC model for vapor-liquid equilibria of polymer solutions”, Fluid Phase Equilib., Vol. 123, pp. 97-106. 1996.

Sanches, I. C. and R. H. Lacombe, “Stastitical thermodynamics of polymer solutions”, Macromolecules, Vol. 11, pp.1145-1156. 1978.

Louli, V. and D. Tassios, “Vapor-liquid equilibrium in polymer-solven systems with a cubic equation of state“., Fluid Phase Equilib., Vol.168, pp.165-182. 2000.

Wong, D. S. H., H. Orbey and S. I. Sandler, “Equation of state

mixing rule for nonideal mixture using available activity coefficient model that allows extrapolation over large range of temperature and pressure”, Ind. Eng. Chem. Res., Vol.31, pp. 2033-2039. 1992.

Michelsen, M. L., “Matching equation of state mixing rules to activity coefficient model expressions”, Fluid Phase Equilib., Vol.121, pp. 15-26. 1996.

Tochigi, K., “Prediction of vapor-liquid equilibria in nonpolymer and polymer solutions using an ASOG-based equation of state (PRASOG)”, Fluid Phase Equilib., Vol.144, pp. 59-68. 1998

DOI: http://dx.doi.org/10.12962/j20882033.v19i3.147


  • There are currently no refbacks.

Creative Commons License

IPTEK Journal of Science and Technology by Lembaga Penelitian dan Pengabdian kepada Masyarakat, ITS is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at http://iptek.its.ac.id/index.php/jts.