Electrolyte Solutions and Osmotic Coefficient of [BMIM][BF4] Ionic Liquid Using New GV-SAFT-MSA Equation of State

Document Type : Research Article

Authors

1 Chemical Engineering Department, Sharif University of Technology, Tehran ,I.R. IRAN

2 Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

Abstract

In this work “Statistical Association Fluid Theory (SAFT)” Equation Of State (EOS) is applied for activity coefficient of electrolyte solution. For considering the presence of ions Mean Spherical Approximation (MSA) term is added to SAFT EOS. The SAFT EOS can predict the thermodynamic properties of associating fluids like H2O and by adding the MSA term, the thermodynamic properties of electrolyte solutions can be obtained. In this work a new term for hard-sphere reference fluid is used. The proposed model has three adjustable parameters. In this the work correlation of activity coefficient for 14 electrolyte solutions is considered. The results show that the proposed model can correlate very well the activity coefficient. The proposed model can also correlate better than Pitzer model the osmotic coefficient of ionic liquid solution [BMIM][BF4] as an organic salt at different temperatures.    

Keywords

Main Subjects

References

[1] Liu Z.P., Wang W., Li Y.G., An Equation of State for Electrolyte Solutions by a Combination of Low-Density Expansion of Non-Primitive Mean Spherical Approximation and Statistical Associating Fluid Theory, Fluid Phase Equilibr., 227, p. 147 (2005).
[2] Anderko A., Wang P., Rafal M., Electrolyte Solutions: From Thermodynamic and Transport Property Models to the Simulation of Industrial Processes, Fluid Phase Equilibria., 194-197, p. 123 (2002).
[3] Liu W-B., Li Y-G., Lu J-F., A New Equation of State for Real Aqueous Ionic Fluids Based on Electrolyte Perturbation Theory, Mean Spherical Approximation and Statistical Associating Fluid Theory, Fluid Phase Equilibria, 158-160, p. 595 (1999).
[4] Muller E.A., Gubbins K.E., Molecular-Based Equations of State for Associating Fluids: A Review of SAFT and Related Approaches, Ind. Eng. Chem. Res., 40, p. 2193 (2001).
[5] Herzoga S., Grossb J., Arlt W., Equation of State for Aqueous Electrolyte Systems Based on the Semirestricted Non-Primitive Mean Spherical Approximation, Fluid PhaseEquilibria, 297, p. 23 (2010).
[6] Chapman W.G., Gubbins K.E., Jackson G., Radosz M., New Reference Equation of State for Associating Liquids, Ind. Eng. Chem. Res., 29, p. 1709 (1990).
[7] Prausnitz J.M., Lichtenthaler R.N., De Azevedo E.G., "Molecular Themodynamics of Fluid Phase Equilibria", Prentice Hall Inc., Englwood Cliffs, NJ, (1999).
[8] Robinson R.A., Stokes R.H., "Electrolyte Solutions", 2nd ed., Butterworths, London, (1959).
[9] Blum L., Hoye J.S., Mean Spherical Model for Asymmetric Electrolytes, 2.Thermodynamic Properties and the Pair Correlation Function, J.Phys.Chem., 81, p. 1311 (1977).
[10] Salimi. H.R., Taghikhani V., Ghotbi C., Application of the GV-MSA Model to the Electrolyte Solutions Containing Mixed Salts and Mixed Solvents, Fluid Phase Equilibria, 231, p. 67 (2005).
[11] Ghotbi C., Azimi G., Taghikhani V., Juan H. Vera, On the Correlation of the Activity Coefficients in Aqueous Electrolyte Solutions Using the K-MSA Model,Ind. Eng. Chem. Res., 42,p. 1279 (2003).
[12] Ghotbi C., Vera H.J., Performance of Three Mixing Rules Using Different Equations of State for Hard-Spheres, The Canadian Journal of Chemical  Englneerlng, 79, p. 678 (2001).
[13] Shekaari H., Sedighehnaz S. Mousavi, Measurement and Modeling of Osmotic Coefficients of Aqueous Solution of Ionic Liquids Using Vapor Pressure Osmometry Method, Fluid Phase Equilibria, 279, p. 73 (2009).

Files

Share

How to cite

Statistics