Polyimide-based mixed matrix membrane for CO2/CH4 separation: Improvement in plasticization resistance by incorporation of polyaniline-modified clay
Paper ID : 1218-MST2015-FULL
Akbar Samadi gh1, Amir Navarchian *2
1Ph.D student
2Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran
This work represents the incorporation of polyaniline-modified clay (PC) into a glassy polyimide (Matrimid®) to improve the plasticization resistance of the membrane against CO2 gas. First, Emeraldine-base polyaniline was synthesized by in-situ polymerization in presence of organophilic clay (30B) and then mixed-matrix membrane (MMMs) of Matrimid-PC was fabricated by solution casting method. Chemical structures and morphologies of PC powder and fabricated membranes were analyzed by Furrier transform infrared (FTIR), X-ray diffraction (XRD) analysis. The gas permeability tests for CO2 at different pressures (4 to 30bar) performed by a variable-pressure-constant-volume apparatus. The characterization analysis of PC powder revealed the exfoliation of clay platelets with flower petal morphology. Although, the gas permeability results showed a typical plasticization behavior for Matrimid at the pressure of about 10 bar, addition of PC particles into the membrane matrix, resulted the plasticization pressure to shift toward higher pressures and the membrane become less susceptible to plasticization by CO2 gas. The higher PC content, the less plasticization behavior was observed. At PC concentration more than 10 wt%, no plasticization pressure was seen up below 30 bar which leads to application of the MMMs in higher CO2 feed pressure up to 30 bar that consequently increases membrane productivity from 300% while with selectivity is also increased from of 40 to 42. The presence of thermally-chemically stable polyaniline with high plasticization resistance and also the rigidification of the Matrimid by clay layers are the main factors that increase the membrane resistance to plasticization.
Matrimid, plasticization, polyaniline, clay, CO2/CH4 separation
Status : Paper Accepted (Oral Presentation)