Preparation and characterization of polymeric blend and mixed matrix membranes by water vapor induced phase inversion

Kibar, Seren
Asymmetric polymeric thin film membranes are commonly produced by using non-solvent induced phase inversion process. The membrane solution is cast to a glass plate and then it is brought into contact with a coagulant. Coagulant type affects the asymmetric membrane structure and the skin formation according to phase separation mechanism. They are related with the membrane gas permeation and separation performances. In this study, asymmetric blend and mixed matrix membranes were produced by using dry/wet phase inversion method. The dry phase inversion were performed by using infrared light, while the wet phase inversion was carried out by using water vapor with 80% relative humidity as non-solvent. To achieve to desired relative humidity value, the membrane casting processes were executed in a conditioning glove box. Polyethersulfone(PES) and polyimide(PI) were used as polymeric materials for blend membrane preparation. Solvents which were used during membrane solution preparation were dimethylformamid(DMF) and tetrahydrofuran(THF). For the mixed matrix membranes, same polymers were used and the 60nm ZIF-8 was used. ZIF-8 has high gas adsorption capacity and has good chemical and thermal stability. Polymeric blend membranes were prepared with the ratio of PES/PI/20/80, PES/PI/50/50 and PES/PI/80/20. The mixed matrix membranes were produced by adding 10% ZIF-8 filler to the same polymer ratio of blend membranes. H2, CO2 and CH4 permeances of both blend and mixed matrix membranes were measured at 35°C. H2/CO2, CO2/CH4 and H2/CH4 ideal selectivities were calculated. CO2/CH4 mixture separation performances of the membranes were measured by analyzing feed and permeate gas using gas chromatography


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Kalıpçılar, Halil; Noble, RD; Falconer, JL (2002-12-01)
Alumina-coated, silicon carbide monoliths were used as supports for B-ZSM-5 zeolite membranes, which were synthesized by in situ hydrothermal crystallization. Both 2 turn x 2 mm (66 channels) and 4 mm x 4 mm (22 channels) monoliths with effective membrane area/volume ratios of 10.6 and 7.2 cm(2)/cm(3), respectively, were used. The membranes separated C-4 and C-6 hydrocarbon isomer vapor mixtures with high selectivities. The selectivities and permeances were comparable to tubular ZSM-5 membranes for butane i...
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Çulfaz Emecen, Pınar Zeynep; Kalıpçılar, Halil (2006-06-20)
MFI type zeolite membranes were prepared on seeded tubular alumina supports in a flow system where the synthesis solution was circulated through the support with flow rates of 6, 24 and 48 mL/min. Syntheses were carried out using clear solutions, at 80 degrees C and 95 degrees C at atmospheric pressure in the flow system, and at autogeneous pressure in the batch system. The membranes synthesized in the flow system had thickness of 1-2 mu m, and were thinner than the membranes synthesized in the batch system...
Development of alumina supported ternary mixed matrix membranes for separation of H-2/light-alkane mixtures
Topuz, Berna; Yılmaz, Levent; Kalıpçılar, Halil (2012-10-01)
Ternary component mixed matrix membrane was prepared from PES, SAPO-34 and 2-hydroxy 5-methyl aniline on a macroporous alumina disk by the solvent evaporation method in order to investigate the effect of existence of an inorganic support. The membrane and its pure PES/Alumina counterpart were characterized by single gas permeability measurements of H-2, CH4, C2H6 and C3H8. The corresponding H-2/CH4 selectivities of membranes were 71.3 and 41. The membranes were also used to separate equimolar mixtures of H-...
Preparation of patterned microfiltration membranes and their performance in crossflow yeast filtration
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Patterned microfiltration membranes were fabricated via Phase Separation Micro Fabrication (PSMF) using vapor-induced phase separation to avoid skin formation on the nonpatterned surface. A starting solution of 10% PES, 60% PEG400, 5% water and 25% NMP yielded symmetric membranes with similar pore size all throughout the cross section when 10 or 15 min of vapor exposure was used before further coagulation in water. On the other hand, 5 min of vapor exposure resulted in what may be called inverse asymmetric ...
Modelling of asymmetric membrane formation
Mchugh, A.j.; Yılmaz, Levent (American Chemical Society; 1986-09-01)
Asymmetric membranes are generally prepared by the phase inversion techniques, the principal steps of which involve casting a thin film of a homogeneous polymer solution onto a suitable substrate, followed by quenching in a nonsolvent bath to precipitate the membrane film. Since most studies of the process has been concerned with the development of specific preparation recipies, explanations of structure formation have generally been ad-hoc and qualitative. This paper presents the results of recent modellin...
Citation Formats
S. Kibar, “Preparation and characterization of polymeric blend and mixed matrix membranes by water vapor induced phase inversion,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Chemical Engineering., Middle East Technical University, 2019.