Gas separation performance of carbon dioxide-selective poly(vinyl alcohol) – ionic liquid blend membranes: The effect of temperature, feed pressure and humidity

• Gas and vapour transport in Poly(vinyl alcohol)/[EMIM][DCA] blend membranes are studied. CO 2 is highly pressure-dependent at low pressure, suggesting facilitated to play a role. Permeability, solubility diffusivity follow-Arrhenius-type temperature dependence. Humidity the gas feed improves /CH 4 mixed separation performance. Membrane technology rapidly emerging as an alternative traditional processes, increasingly challenging separations require constant search for new better-performing materials. This paper reports performance of poly (vinyl alcohol) (PVA) membrane blended with 53 wt% ionic liquid 1-ethyl-3-methyl-imidazolium dicyanamide ([EMIM][DCA]), known from our previous work /H “reverse-selective” material, under different experimental conditions. The material properties solution-cast discussed compared neat PVA polymer. Pure permeation measurements show drastic increase permeability all gases (H , He, O N CH ) polymer, change diffusion-selective sorption-selective behaviour. further increases over range 25 °C 55 accompanied by decrease selectivity most pairs, particular, /N except H /CO pair. Mixed mixture beneficial effect humidity on selectivity. supported sorption measurements, which high affinity water lower alcohols.