%0 Journal Article %T Separation of C3H8 and C2H6 from CH4 in polyurethane–zeolite 4Å and ZSM-5 mixed matrix membranes %A Tirooni, Iman %A Morteza Sadeghi %A Pakizeh, Majid %J Separation and Purification Technology %@ 1383-5866 %D 2015