Performance of nitrile-containing anions in task-specific ionic liquids for improved CO2/N2 separation

PVDF/ionic liquid polymer blends with superior separation performance for removing CO2 from hydrogen and flue gas

“…4, although the solubility increment is not as pronounced as the diffusivity increment; the CO 2 solubility of the blend membrane is higher than those observed in rubbery polymeric membranes [40e43]. This is owing to the fact that the ionic liquid used in this study has a high CO 2 solubility and the CO 2 solubility of [emim][B(CN) 4 ] is even higher than [emim][Tf 2 N] which is the most popular ionic liquid used for CO 2 separation [28]. Fig.…”

“…As the gas permeability in the RTIL phase is much higher than the host polymer, this heterogeneous system can be conceptualized as a SILM where the polymer matrix provides mechanical stability and the gas permeates mainly through the RTIL phase. 4 ] as the ionic liquid phase because it has the highest CO 2 permeability and CO 2 /N 2 selectivity among all reported ionic liquids [27,28]. In addition, both [emim][B(CN) 4 ] and PVDF can be dissolved readily in acetone and form a homogeneous solution.…”

Surface tensions of ionic liquids: Non-regular trend along the number of cyano groups

“…Since then, a large interest on their application has emerged, comprising the application of cyano-based ILs as fluoro-free alternatives in the development of lithium-conducting electrolytes [19,20], and in organic dye-sensitized solar cells [21]. Cyano-based ILs have also been studied as alternative solvents in separation approaches, namely in the extraction of aromatics from aromatic/aliphatic mixtures [22], in the extraction of phenolic compounds from biomass [23], in the selective separation of CO 2 and N 2 (using supported IL membranes) [24], and in the separation and recovery of alcohols from aqueous media [14,25]. For a better design of these processes, the solvation capacity and ability to establish hydrogen bonds with water and ethanol [26,27], the volumetric properties of binary mixtures composed of benzene and cyano-based ILs [28], and thermophysical properties, such as densities, viscosities and refractive index [29] of these CN-based fluids, have been evaluated.…”

Solubility of carbon dioxide in the low-viscosity ionic liquid 1-hexyl-3-methylimidazolium tetracyanoborate

“…Moreover, the application of [TCB − ]-based ionic liquids for alcohol extraction from aqueous mixtures has been reported [37]. Finally, the solubility of CO 2 in [emim][TCB] at low and moderate pressures (up to 1 MPa) and the performance of [emim][TCB] for gas separation processes was discussed [38]. However, the high pressure phase behavior data of [TCB − ]-based ionic liquids with several gases is completely absent for this family of ionic liquids.…”