alexa Non-equilibrium thermodynamic analysis of transport properties in the nanofiltration of ionic liquid-water solutions.
Biochemistry

Biochemistry

Journal of Membrane Science & Technology

Author(s): Wu B, Zhang YM, Wang HP

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Abstract Thenanofiltration of aqueous solutions of the ionic liquids (ILs) 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF(4)), and 1-butyl-3-methylimidazolium bromide ([Bmim]Br) with a polyamide nanofiltration membrane was investigated. The practical transport coefficients, including hydrodynamic permeability (L(p)), reflection (sigma) and solute permeability (omega) were calculated in terms of a non-equilibrium thermodynamics approach. It was found that L(p) and sigma 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]BF(4) 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. This article was published in Molecules and referenced in Journal of Membrane Science & Technology

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