The unique properties of ionic liquids (ILs), such as insignificant vapor pressure, thermal stability above 200oC, functional diversity, and the high selectivity and permeability for CO2, make them ideal candidates for CO2 removal from gas streams such as post-combustion flue gas, pre-combustion syngas, and natural gas. Several research groups have successfully demonstrated the application of ionic liquids in the form of supported ionic liquid membranes (SILMs) in which an IL is suspended within the pores of a membrane support and serves as the active gas transport medium of the membrane [1,2,3]. The morphology and geometry of the porous support contribute significantly to the gas separation efficiency of these ILs. The scope of this investigation is to identify polymeric structures and morphologies that optimize the efficiency of ILs for gas separation. Preliminary work was carried out using a well known and characterized IL, 1-hexyl-3-methyl-imidazolium bis(trifluoromethyl-sulfonyl)imide ([hmim][Tf2N]) with  Matrimid� as the polymeric support material in the form of porous hollow fibers and spheroids. The CO2 transport properties were recorded for the IL in Matrimid� supports with enhanced morphological features from 30 to 200 oC. The processing techniques developed here have enabled a substantial improvement in both separation efficiency and application strategies.

Porous polymeric supports for ionic liquid based CO<sub>2</sub> separation

244th National Meeting (2012)

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Porous polymeric supports for ionic liquid based CO2 separation

Porous polymeric supports for ionic liquid based CO₂ separation