Abstract
This work aims to explore the gas permeation performance of two newly-designed ionic liquids, [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2], in supported ionic liquid membranes (SILM) configuration, as another effort to provide an overall insight on the gas permeation performance of functionalized-ionic liquids with the [C2mim]+ cation. [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] single gas separation performance towards CO2, N2, and CH4 at T = 293 K and T = 308 K were measured using the time-lag method. Assessing the CO2 permeation results, [C2mim][CF3BF3] showed an undermined value of 710 Barrer at 293.15 K and 1 bar of feed pressure when compared to [C2mim][BF4], whereas for the [C2mim][CF3SO2C(CN)2] IL an unexpected CO2 permeability of 1095 Barrer was attained at the same experimental conditions, overcoming the results for the remaining ILs used for comparison. The prepared membranes exhibited diverse permselectivities, varying from 16.9 to 22.2 for CO2/CH4 and 37.0 to 44.4 for CO2/N2 gas pairs. The thermophysical properties of the [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] ILs were also determined in the range of T = 293.15 K up to T = 353.15 K at atmospheric pressure and compared with those for other ILs with the same cation and anion’s with similar chemical moieties.
Highlights
Ionic Liquids (ILs) were first introduced as a green alternative to conventional organic solvents, mainly due to their vanishing vapor pressure [1], it was their unusual set of properties, such as low volatility, high thermal stability, low flammability [2,3] together with the possibility to tune the ILs properties through the combination of endless number of cations and anions [4], that afforded their popularity
This work aims to explore the gas permeation performance of two newly-designed ionic liquids, [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2], in supported ionic liquid membranes (SILM) configuration, as another effort to provide an overall insight on the gas permeation performance of functionalized-ionic liquids with the [C2mim]+ cation. [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] single gas separation performance towards CO2, N2, and CH4 at T = 293 K and T = 308 K were measured using the time-lag method
We introduced a new method for the synthesis of K[CF3BF3] (Scheme 4)
Summary
Ionic Liquids (ILs) were first introduced as a green alternative to conventional organic solvents, mainly due to their vanishing vapor pressure [1], it was their unusual set of properties, such as low volatility, high thermal stability, low flammability [2,3] together with the possibility to tune the ILs properties through the combination of endless number of cations and anions [4], that afforded their popularity. Ionic liquid-based membranes have won the interest of the scientific community since they gather the benefits of membrane separation, together with the unique characteristics of ILs. Several studies show the feasibility of using these membranes at an industrial scale to capture CO2 from flue gases [5] to purify natural gas [6], in the recovery and enrichment of biohydrogen [7], to separate hydrogen from ammonia purge gas [8], to obtain oxygen or inert gases, and to separate volatile organic compounds (VOCs) from gas streams [9]. The success of SILMs is well highlighted in recently published reviews [4,12,13,14,15,16,17]
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