Molecules 2009, 14(5), 1781-1788; doi:10.3390/molecules14051781
Article

Non-Equilibrium Thermodynamic Analysis of Transport Properties in the Nanofiltration of Ionic Liquid-Water Solutions

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Received: 1 April 2009; in revised form: 18 April 2009 / Accepted: 27 April 2009 / Published: 11 May 2009
(This article belongs to the Special Issue Ionic Liquids)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Thenanofiltration of aqueous solutions of the ionic liquids (ILs) 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4), and 1-butyl-3-methylimidazolium bromide ([Bmim]Br) with a polyamide nanofiltration membrane was investigated. The practical transport coefficients, including hydrodynamic permeability (Lp), reflection (σ) and solute permeability (ω) were calculated in terms of a non-equilibrium thermodynamics approach. It was found that Lp and σ diminished as the concentration of the IL solutions increased. These characteristics are similar to those observed in inorganic electrolyte-water systems. In addition, it was shown that the rejection and volume flux for both ionic liquid solutions rose with feed pressure, while it decreased with feed concentration. The maximum rejection efficiencies for [Bmim]Br and [Bmim]BF4 are 67 % and 60 %, respectively, on our experimental scale. All the data suggests that a highly efficient process for IL separation could be developed when the operating conditions are optimized further.
Keywords: Ionic liquid; nanofiltration; irreversible thermodynamics; transport coefficients; rejection
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MDPI and ACS Style

Wu, B.; Zhang, Y.M.; Wang, H.P. Non-Equilibrium Thermodynamic Analysis of Transport Properties in the Nanofiltration of Ionic Liquid-Water Solutions. Molecules 2009, 14, 1781-1788.

AMA Style

Wu B, Zhang YM, Wang HP. Non-Equilibrium Thermodynamic Analysis of Transport Properties in the Nanofiltration of Ionic Liquid-Water Solutions. Molecules. 2009; 14(5):1781-1788.

Chicago/Turabian Style

Wu, Bo; Zhang, Yu M.; Wang, Hua P. 2009. "Non-Equilibrium Thermodynamic Analysis of Transport Properties in the Nanofiltration of Ionic Liquid-Water Solutions." Molecules 14, no. 5: 1781-1788.

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