Effect of [emim][BF₄] ionic liquid concentration on ionic liquid-polymeric membrane (ILPM) for CO₂/CH₄ separation

Abstract

Abstract In the current study, polyethersulfone based (emim)[bf 4 ] ionic liquid polymeric membranes (ILPMs) were synthesised for CO 2 separation from CH 4 . Two weight percentages (10% and 20%) of (emim)[bf 4 ] ionic liquid was added in the prepared doped solution; flat sheet dense membranes were synthesised by the dry phase inversion method. Field Emission Scanning Electron Microscope (FESEM) was used to analyse membranes morphology. Elemental composition of the membranes was examined using Energy Dispersive X-ray (EDX). Distribution of IL in the polymer matrix was observed with the help of mapping. The gas permeation experiments were performed at ambient room temperature and 4 bar pressure. All membranes showed dense and non-porous structure which depicted the good compatibility of polymer and ionic liquid. Presence of additional elements such as nitrogen and fluorine in PES/[emim] [bf 4 ] membranes confirmed the presence of ionic liquid in the polymer. Mapping of fluorine element shown the uniform distribution of ionic liquid in the synthesised ILPMs. Membrane having ionic liquid 20 weight % showed a nearly 39-fold increase in CO 2 gas permeability compared to pure polyethersulfone membrane and 2.31-fold increase in ideal selectivity of CO 2 /CH 4 . The synthesised ILPMs have immense potential for CO 2 separation from natural gas.