The results obtained through the effect of the zeolite on the
Hydrocarbon separation properties of the studied polyurethanes
confirm that PU2-ZSM5 20 wt% has the best performance. Fig. 7
represents the trade-off properties of studied MMMs in Propane/
Methane separation. As shown in this figure, the permeability
and selectivity of Propane is increased by the addition of ZSM-5
to PU2 up to 20 wt%. The presented results in Fig. 7 confirm the significant
enhancement in the separation of Hydrocarbons from
Methane by addition of ZSM-5 to polyurethane membranes.