Polimer /MOF VE polimer/MOF/uyumlaştırıcıdan oluşan ikili ve üçlü karışık matrisli membranların gaz ayrım performansları

Download
2012
Keser, Nilay
Yılmaz, Levent
Gas separation performances of the binary (PES/MOF) and ternary (PES/MOF/additive) mixed matrix membranes Membrane separation is the most widely used separation technique nowadays. Mixed matrix membranes are formed by the incorporation of nanoporous molecular sieves into polymeric membranes. MMMs have gained importance in academic areas because they combine the desirable properties of the polymers and the inorganic materials and they have a very big potential in commercial usage (Mulder,1996). In this project polyethersulfone (PES) was be used as polymeric material, and one type of metal organic framework (MOF) was used as porous filler material that has been attracted very much attention in literature nowadays. MOFs are very promising adsorbents with tunable pore size, large pore volume, high specific surface area, high and selective gas adsorption capacities (Adams,2010). Combination of an inorganic cluster and an organic bridge in their structure makes them good candidates for membrane applications in the aspect of compatibility (Perez,2009). The proposed MOF type is ZIF-8. Also to increase the compatibility between the PES and ZIF-8, a low molecular weight material, 2-hydroxy 5-methyl aniline (HMA), was used as a third component in membrane formulation. In order to investigate the effect of ZIF-8 loading on the membrane performance, different types of membranes were prepared with varying amounts of ZIF-8 between 10-60% (w/w). Moreover, ternary mixed matrix membranes were synthesized consisting of different amounts of ZIF-8 between 10-30% (w/w) and HMA 1-10% (w/w). Gas transport properties of the membranes were investigated by single gas permeation experiments of H2, CO2 and CH4 at 3 bar feed pressure and binary gas permeation experiments of CO2/CH4 pair. Also in order to investigate the effect of feed pressure on the gas transport properties of the membranes, single gas experiments were conducted on 3, 6, 8, 10 and 12 bar feed pressures. Moreover the morphology and thermal characteristics of the membranes were characterized by scanning iv electron microscopy (FEI Quanta-400 F), thermal gravimetric analysis (Shimadzu DTG-60H), differential scanning calorimetry (Shimadzu DSC60) analysis.

Suggestions

Polymer blend based mixed matrix gas separation membranes
Karğılı, Melis; Yılmaz, Levent; Kalıpçılar, Halil; Department of Polymer Science and Technology (2015)
Polymer blending and mixed matrix membranes are two methods suggested to improve performance of gas separation membranes. Dense and asymmetric membranes of PES/PI blends with different compositions were prepared and the effect of blend composition on gas separation performances was investigated. In addition, PES/PI/ZIF-8 blend based mixed matrix membranes were prepared in order to investigate the effect of nano-porous filler addition to polymer blends. ZIF-8 particles with size of 83 nm were synthesized. Pa...
Polycarbonate based zeolite 4a filled mixed matrix membranes: preparation, characterization and gas separation performances
Şen, Değer; Yılmaz, Levent; Department of Chemical Engineering (2008)
Developing new membrane morphologies and modifying the existing membrane materials are required to obtain membranes with improved gas separation performances. The incorporation of zeolites and low molecular-weight additives (LMWA) into polymers are investigated as alternatives to modify the permselective properties of polymer membranes. In this study, these two alternatives were applied together to improve the separation performance of a polymeric membrane. The polycarbonate (PC) chain characteristics was a...
Polyimide and PEBAX flat and hollow fiber membranes for gas separation
Özdemir, Nur Konçüy; Kalıpçılar, Halil; Department of Chemical Engineering (2017)
This thesis analyzes the effect of polyimide (PI) hollow fiber membrane spinning conditions including dope solution flow rate, bore liquid flow rate, addition of more volatile solvent to dope solution, air gap height and heating zone temperature on the ideal gas separation performance and membrane morphology. The effect of PEBAX1657 coating of PI hollow fiber membrane was also investigated. The effect of incorporation of ZIF-8 crystals to PEBAX1657 flat sheet membrane, the effect of coagulant type for the p...
Fabrication of helical polymeric hollow fiber membranes and characterization of their fouling behaviours
Yücel, Hazal; Çulfaz Emecen, Pınar Zeynep; Department of Chemical Engineering (2018)
Membranes are used in many separation processes such as gas separation, microfiltration, ultrafiltration and hemodialysis. Hollow fiber membranes are advantageous since they have a high surface area per volume and are easily backwashed which is an advantage for fouling removal. The most important factors that affect the performance of filtration membranes are concentration polarization and fouling. They increase operational cost and reduce membrane lifetime and permeate flux. One approach that can reduce co...
Synthesis, characterization, and polymerization of polyether bridged thiophene and aniline derivatives
Tirkeş, Seha; Önal, Ahmet Muhtar; Department of Polymer Science and Technology (2008)
New compounds consisting of 3-thienyl and aniline units linked by polyether bridges have been synthesized and their electrochemical polymerization was performed via constant potential electrolysis and cyclic voltammetry. In the case of 3-thienyl derivatives two compounds, 1,12-di-3-thienyl-2,5,8,11-tetraoxadodecane (MI) and 1,15-di-3-thienyl-2,5,8,11,14-pentaoxapentadecane (MII) were synthesized utilizing literature methods and their corresponding polymers, poly(I) and poly(II) were prepared in an electroly...
Citation Formats
N. Keser and L. Yılmaz, “Polimer /MOF VE polimer/MOF/uyumlaştırıcıdan oluşan ikili ve üçlü karışık matrisli membranların gaz ayrım performansları,” 2012. Accessed: 00, 2020. [Online]. Available: https://app.trdizin.gov.tr/publication/project/detail/TVRJek16azU.