Tunning CO2 Separation Performance of Ionic Liquids through Asymmetric Anionsстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
Аннотация:This work aims to explore the gas permeation performance of two newly-designed ionicliquids, [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 permeationperformance 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 Kand 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 pressurewhen compared to [C2mim][BF4], whereas for the [C2mim][CF3SO2C(CN)2] IL an unexpected CO2permeability of 1095 Barrer was attained at the same experimental conditions, overcoming theresults for the remaining ILs used for comparison. The prepared membranes exhibited diversepermselectivities, varying from 16.9 to 22.2 for CO2/CH4 and 37.0 to 44.4 for CO2/N2 gas pairs. Thethermophysical properties of the [C2mim][CF3BF3] and [C2mim][CF3SO2C(CN)2] ILs were alsodetermined in the range of T = 293.15 K up to T = 353.15 K at atmospheric pressure and comparedwith those for other ILs with the same cation and anion’s with similar chemical moieties.