Nano composite PEBAX®/PEG membranes: Effect of MWNT filler on CO۲/CH۴ separation

The performances of two-phase polymer-liquid PEBAX®/polyethylene glycol (PEG) and three-phase polymer-liquid-solid PEBAX®/PEG/MWNT thin film composite membranes for CO۲ and CH۴ permeation were studied. The effect of temperature and MWNT/PEBAX® ratio on single gas (CO۲ and CH۴) permeability was investigated. The permeation of both gases was measured at different temperatures from ۳۰۳ to ۳۲۳ ˚K. The results exhibited that the PEBAX®/PEG/MWNT membrane had better permeability for CO۲ in comparison to the PEBAX®/PEG membrane, whereas CO۲/CH۴ selectivities in both membranes were almost the same; i.e. MWNT filler promoted the performance of PEBAX®/PEG membrane in CO۲/CH۴ Separation. Also, the permeability increases with temperature in all experiments. For the three-phase PEBAX®/PEG/MWNT membrane, CO۲ permeability was determined ۲۲۱ Barrer in ۳۲۳˚K and the selectivity was obtained as ۲۳ in ۳۰۳ ˚K.