Abstract
Ionic liquids (ILs) possess low vapor pressure, thermal stability, wide chemical solubility window and ease of tunability of physical and chemical properties, which make them attractive solvents. ILs have been successfully examined for CO2 capture processes alone and in combinations with different materials. Recently, ionic liquid-based membranes have exhibited attractive characteristics for CO2 separation. This manuscript introduces various CO2 separation technologies including the ionic liquid membranes (ILMs). The various types of ILMs, such as supported ionic liquid membranes (SILMs), room temperature ionic liquid based SILMs, functionalized ILMs, polyionic liquid membranes, composite membranes, IL-gel membranes, and mixed matrix membranes (MMMs) are discussed in detail. The CO2 permeability and selectivity of CO2 over N2 and CH4 for various membranes are reported and critically analyzed. Furthermore, the stability of the ionic liquid membranes is reported and discussed with respect to the addition ionic liquids, proper size of the porous support, the selection of support of the membrane etc.
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