(646h) Sod-Zmof/Polyimide MIXED-Matrix Membranes for CO2 Separation | AIChE

(646h) Sod-Zmof/Polyimide MIXED-Matrix Membranes for CO2 Separation


Kiliç, A. - Presenter, Istanbul Technical University
Tantekin-Ersolmaz, S. B., Istanbul Technical University
Ahunbay, M. G., Istanbul Technical University
Atalay-Oral, C., Istanbul Technical University
Sirkecioglu, A., Istanbul Technical University
Eddaoudi, M., King Abdullah University of Science and Technology
Shekhah, O., King Abdullah University of Science and Technology
Polymer/MOF mixed matrix membranes offer enhanced gas sepration performance compared to neat polymeric membranes. In designing such membranes, the selection of polymer/MOF pairs is of crucial importane. Polyimides have been of interest as polymeric gas separation membranes for a long while due to their thermal and mechanical properties. On the other hand, eeolite-like metal organic frameworks (ZMOFs), which are a subclass of MOFs, are promising candidates for separation and purification applications. They have extra-framework ions in the pores of molecular dimensions increasing the interactions with guest molecules and improving their separation, storage, or ion-exchange capability. The charge-compensating extra-framework ions inside the cavities of ZMOFs can be ion-exchanged with alkali metals and this is expected to increase their affinity for CO2 and improve the CO2 separation performance of polyimide based mixed matrix membranes for gas mixtures like natural gas (CO2/CH4) and flue gas (CO2/N2).

In this work, as-synthesized and alkali ion-exchanged sod-ZMOF nanoparticles were used to develop polyimide/ZMOF mixed matrix membranes. Two different types of polyimides (Matrimid® 5218 and 6FDA-DAM) and one copolyimide (6FDA-BTDA-pBAPS) were chosen for this purpose. After the analyses of structural and thermal characteristics of the prepared membranes; CO2/CH4 and CO2/N2 separation performance of the membranes were tested in terms of CO2/CH4 and CO2/N2 separation performances via single and mixed gas permeability measurements.

This work is part of the project supported by the Scientific and Technological Research Council of Turkey (TUBITAK) through the grant no. 113M776.