Gas separations in fluoroalkyl-functionalized room-temperature ionic liquids using supported liquid membranes

Supported room temperature ionic liquid membranes for CO2/CH4 separation

“…Imidazolium-based task-specific ionic liquids on porous hydrophilic polytetrafluoroethylene support 800 7.7 × 10 −9 55 [21] Imidazolium-based ionic liquids in polysulfone support 330-740 7.3 × 10 −10 to 1.6 × 10 −9 4.7-6.0 [28] Imidazolium-based ionic liquids in polyethersulfone microfiltration support 360-980 8.0 × 10 −10 to 2.2 × 10 −9 6.6-10 [6] Phosphonium-based ionic liquids supported on glass fiber disk filters 544-1700 2.8 × 10 −10 to 8.8 × 10 −10 12-13 [27] Supported ionic liquid membranes on poly vinylidene fluorolide support 94-750 2.1 × 10 −10 to 1.7 × 10 −9 5.7-23 [18] Imidazolium-based supported ionic liquid membranes on PES porous disk support 310-740 7.9 × 10 −10 to 1.9 × 10 −9 10-27 [29] Imidazolium-based fluoroalkyl-functionalized supported room-temperature ionic liquid membranes on porous polyethersulfone support 210-320 4.9 × 10 −10 to 7.4 × 10 −10 13-19 [22] Supported ionic liquid membranes prepared on polyvinylidene fluorolide support 6 5.0 × 10 −11 30 [30] Imidazolium-based SILMs on porous hydrophilic polyethersulfone 610-1050 1.3 × 10 −9 to 2.3 × 10 −9 11-20 [8] that several aminopyridinium compounds are thermally stable to at least 550 K [17]. The option of dissolving one ionic liquid with a particular functionality in a bulk ionic liquid with well defined physical properties offers another avenue for obtaining membranes suitable for certain separations.…”

“…It is important to note that this result was obtained at extremely low CO 2 partial pressure of 5 kPa. In another study [22] the imidazolium cation was functionalized with fluoroalkyl groups to investigate the increase in gas solubility. The membranes showed CO 2 permeance of 4.9 × 10 −10 to 7.4 × 10 −10 mol m −2 s −1 Pa −1 and CO 2 /CH 4 selectivity in the range of 13-19.…”

Recent advances in the synthesis and applications of metal organic frameworks doped with ionic liquids for CO 2 adsorption

“…From these results, it was proposed that IL-based adsorbents might provide a new approach to CO 2 removal from industrial gas streams [71]. Since then, a great deal of work has been performed on understanding the relationships between IL structure and CO 2 adsorption with the aim of enhancing CO 2 uptake [72][73][74][75][76][77][78][79][80][81][82][83].…”

Useful Mechanisms, Energy Efficiency Benefits, and Challenges of Emerging Innovative Advanced Solvent Based Capture Processes

“…For example, a shortcoming of ammonia vaporisation [53] [54]. The research on fluoroalkyl-functionalised imidazolium-based solvent membranes revealed CO 2 permeabilities of 210-320 and selectivities of 16-27 (CO 2 /N 2 ) and 13-19 (CO 2 /CH 4 ) [55]. Unconventional IL-based solvent membrane tested in [56] showed selectivities 10-52 (CO 2 /N 2 ), 5-13 (CO 2 /H 2 ) and 5-23 (CO 2 /CH 4 ).…”