Carrier Type Impacts of Pebax Facilitated Membranes on Propylene/Propane Separation Properties
Paper ID : 1212-MST2015-FULL
Lida Asadi1, Fereidoon Mohammadi1, Behrouz Sadatnia2, Amir Dehghani *3
1Department of Petrochemicals Synthesis, Iran Polymer and Petrochemical Institute, P. O. Box 14965/115, Tehran, Iran
2Iran Polymer and Petrochemical Institute
3Department of Chemical Engineering, Engineering Faculty, University of Tehran, P.O. Box: 11465-4563, Tehran, Iran
Propylene/propane separation is an important gas separation process in petrochemical industries. Because of the small differences between molecular size and physical properties involved, separation of these species is a difficult task by conventional solution-diffusion membranes. Facilitated membranes contain a carrier that may selectively transfer one component faster than the other. In this study, the effects of two different carriers, AgBF4 and CAgF3O3S on separation properties of propylene/propane using Pebax membranes were thus investigated. Gas separation results proved that high AgBF4 loading up to 80 wt.% greatly enhances selectivity up to 52.3 while at the same loading, CAgF3O3S showed a selectivity of only 6.1 probably due to a more silver ion activity towards propylene for the former.
SEM images showed a dens upper layer and a porous sublayer in contact, According to DSC results, glass transition temperature of the facilitated Pebax membranes increases with inclusion of both salts probably due to a decline in chain mobility of the polymer matrix. FTIR spectra also showed the C=O vibrations of HN–C=O groups at 1641 cm-1 decreases with both salt loadings.
Propylene/propane separation, Facilitated membranes, AgBF4, CAgF3O3S, Pebax.
Status : Paper Accepted (Poster Presentation)