Blended silicone-ionic liquid membranes: Transport properties of butan-1-ol vapor |
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Authors: | O Vopi?ka V Hynek P Izák |
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Institution: | a Institute of Chemical Technology, Department of Physical Chemistry, Technická 5, 166 28 Prague 6, Czech Republic b Institute of Chemical Process Fundamentals, Rozvojová 135, 165 02 Prague 6, Czech Republic |
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Abstract: | This paper is focused on modeling of sorption and desorption kinetics as well as on equilibrium butan-1-ol vapor sorption in blended poly(dimethylsiloxane)-benzyl-3-butylimidazolium tetrafluoroborate membranes. Based on the generalized Fick’s second law, on time-dependent boundary conditions and on two models of equilibrium sorption, the diffusion coefficients of butan-1-ol were calculated from the experimental data using the finite difference modeling. Although anomalous sorption occurred at higher concentrations of butan-1-ol, the diffusion coefficients calculated from the data on sorption and desorption kinetics were in a good agreement. The increase of the ionic liquid content in poly(dimethylsiloxane) elevated the butan-1-ol equilibrium concentration in the membrane, and, at the same time, decreased the values of butan-1-ol diffusion coefficient. |
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Keywords: | Ionic liquid PDMS Sorption kinetics Finite difference modeling Butanol vapor Butan-1-ol |
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