This study is focused on the development of ionic liquids (ILs) based poly meric membranes for the separation of carbondioxide (CO2) from methane (CH4).
The advantage of ILs in selective CO2absorption is that it enhances the CO2selective separationfor the ionic liquid membranes (ILMs). ILMs are developed and characterized with two different ILs using the solution-castingmethod. Three different blend compositions of ILs and polysulfone (PSF) are selected for each ILMs 10, 20, and 30 wt %. Effect ofthe different types of ILs such as triethanolamine formate (TEAF) and triethanolamine acetate (TEAA) are investigated on PSF-basedILMs. Field emission scanning electron microscopy analysis of the membranes showed reasonable homogeneity between the ILs andPSF. Thermograv imetric analysis showed that by increasing the ILs loading thermal stability of the membranes improved. Mechanicalanalysis on developed membranes showed that ILs phase reduced the amount of plastic flow of the PSF phase and therefore, fracturetakes place at gradually lower strains with increasing ILs content. Gas permeation evaluation was carried out on the developed mem-branes for CO2/CH4separation between 2 bar to 10 bar feed pressure. Results showed that CO2permeance increases with the addi-tion of ILs 10–30 wt % in ILMs. With 20–30 wt % TEAF-ILMs and TEAA-ILMs, the highest selectivity of a CO2/CH453.96 6 0.3,37.64 6 0.2 and CO2permeance 69.5 6 0.6, 55.21 6 0.3 is observed for treated membrane at 2–10 bar. The selectivity using mixed gastest at various CO2/CH4compositions shows consistent results with the ideal gas selectivity.
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