Nano composite PEBAX((R))/PEG membranes: Effect of MWNT filler on CO2/CH4 separation

The performances of two-phase polymer-liquid PEBAX((R)) /polyethylene glycol (PEG) and three-phase polymer-liquidsolid PEBAX((R)) /PEG/MWNT thin film composite membranes for CO2 and CH4 permeation were studied. The effect of temperature and MWNT/PEBAX((R)) ratio on single gas (CO2 and CH4) permeability was investigated. The permeation of both gases was measured at different temperatures from 303 to 323 degrees K. The results exhibited that the PEBAX((R)) /PEG/MWNT membrane had better permeability for CO2 in comparison to the PEBAX((R)) /PEG membrane, whereas CO2/CH4 selectivities in both membranes were almost the same; i. e. MWNT filler promoted the performance of PEBAX((R)) /PEG membrane in CO2/CH4 Separation. Also, the permeability increases with temperature in all experiments. For the three-phase PEBAX((R)) /PEG/MWNT membrane, CO2 permeability was determined 221 Barrer in 323 degrees K and the selectivity was obtained as 23 in 303 degrees K.