329284 Phase Behaviour of Mixtures Containing Imidazolium-Based Bis(trifluoromethylsulfonyl)Imide Ionic Liquids – Experiment and Modelling Using the Soft-SAFT Eqation of State

Zdenek Wagner, Adela Andresova and Magdalena Bendova, E. Hala Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals AS CR, v. v. i., 165 02 Prague 6, Czech Republic

Reliable data on phase equilibria in mixtures of ionic liquids is of particular importance for their application in separation processes as well as for their use as reaction media in homogeneous and heterogeneous catalysis. For all these processes, knowledge of liquid-liquid equilibria in systems of ionic liquids with molecular solvents is essential [1, 2]. Ionic liquids may also be used in mixtures with carbon dioxide as advantageous reaction media – both in monophasic catalysis with supercritical CO2 and in biphasic CO2 as CO2-expanded ionic liquid. To optimize reaction conditions in such applications the solubility in sub- and supercritical CO2 should be first investigated [3].

In this contribution, comparison of previously published experimental data with thermodynamic modeling using the soft-SAFT equation of state [4] will be presented. Examples of liquid-liquid equilibria in binary [5, 6] and ternary systems [7] of imidazolium-based bis(trifluoromethylsulfonyl)imide ionic liquids and their solubility in CO2 [8] will be used to compare the accuracy of prediction of the thermodynamic properties of mixtures of both chosen methods.

References

  1. Müller, A.;  Górak, A. Sep. Purif. Technol. 2012, 97, 130-136.
  2. González, B.; Corderí, S.; Santamaría, A. G. J. Chem. Thermodyn. 2013, 60, 9-14.
  3. Andanson, J.-M.;  Marx, S.;  Baiker, A. Catal. Sci. Technol. 2012, 2, 1403-1409.
  4. Llovell, F.; Valente, E.; Vilaseca, O.; Vega, L. F. J. Phys. Chem. B 2011, 115, 4387-4398.
  5. Jacquemin, J.;  Bendová, M.;  Sedláková, Z.;  Blesic, M.;   Holbrey, J. D.;  Mullan, C. L.;  Youngs, T. G. A.;  Pison, L.;   Wagner, Z.;  Aim, K.;  Gomes, M. F.;  Hardacre, C. ChemPhysChem 2012, 13, 1825-1835.
  6. Bendová, M.; Wagner, Z.; Moučka, M. Int. J. Thermodyn. 2008, 11, 109-114.
  7. Bendová, M.; Sedláková, Z.; Andresová, A.; Wagner, Z. J. Sol. Chem. 2012, 41, 2164-2172.
  8. Sedlakova, Z.; Wagner, Z. Chem. Biochem. Eng. Q. 2012, 26, 55-60.

Acknowledgments

The authors wish to acknowledge the financial support of the Ministry of Education, Youth, and Sports in the frames of the Kontakt programme under grant No. LH12020.


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