Supported Ionic Liquid Membranes and Ion-Jelly Membranes with [BMIM][DCA]: Comparison of Its Performance for CO2 Separation

In this work, a supported ionic liquid membrane (SILM) was prepared by impregnating a PVDF membrane with 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCA]) ionic liquid. This membrane was tested for its permeability to pure gases (CO 2, N 2 and O 2) and ideal selectivities were calculated. The SILM performance was also compared to that of Ion-Jelly ？ membranes, a new type of gelled membranes developed recently. It was found that the PVDF membrane presents permeabilities for pure gases similar or lower to those presented by the Ion-Jelly ？ membranes, but with increased ideal selectivities. This membrane presents also the highest ideal selectivity (73) for the separation of CO 2 from N 2 when compared with SILMs using the same PVDF support but with different ionic liquids.