Gas separation using facilitated transport membranes (FTM) has been extensively investigated. Major advantages of FTM over conventional polymeric membranes include higher permeabilities for reacting species like CO_2. olefins and the resultant high selectivities over nonreacting species like N_2. paraffins. This is due to the facilitating freaction mechanism in FTMs compared to the solution-diffusion mechanism in polymeric membranes. FTMs are particularly attractive at low reacting species concentrations where the driving force is very low. This is especially advantageous for removal and sequestration of carbon dioxide when it is present in low concentrations. Facilitated transport membranes include immobilized liquid membranes (ILMs) where the carrier in a Solvent, usually water, is immobilized in the pores of the membrane.
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