Ali Kargari - Department of Petrochemical Engineering, Amirkabir University of Technology (Tehran Polytechnic),Mahshahr Campus, P.O. Box ۴۱۵, Mahshahr, Iran.
Hamidreza Sanaeepur - Department of Petrochemical Engineering, Amirkabir University of Technology (Tehran Polytechnic),Mahshahr Campus, P.O. Box ۴۱۵, Mahshahr, Iran.
Abdolreza Moghadassi - Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box ۳۸۱۵۶-۸۷۵, Arak,Iran.
Abtin Ebadi Amooghin - Department of Chemical Engineering, Farahan branch, Islamic Azad University, Farahan, Iran.

Different membranes prepared from blending different molecular weights of poly(ethylene glycol) (PEG) with acrylonitrile-butadiene-styrene (ABS) matrix. Natural gas treatment has been considered via the separation of CO2 from its simple gas mixture with CH4. Here, the effect of PEG content on gas transport properties and the effect of pressure on CO2 permeability have been investigated. The results showed that PEG addition increases the selectivity without significant changes in CH4 permeability

carbon dioxide, gas separation, polymeric membrane, membrane properties