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Separation of Gasses by Supported Liquid Membranes.
Izák, Pavel ; Žitková, Andrea ; Žák, Michal ; Vejražka, Jiří ; Kárászová, Magda ; Petrusová, Zuzana
Two swollen polyamide thin-film composite membranes were tested for effective CO2/CH4 separation. It was found that the water wettability has a key role for the separation of binary mixture representing a raw biogas, i.e. containing CO2 and CH4. The transport properties were analyzed by means of a mathematical model simulating gas permeation. A new modification of the mass transport coefficient model provided the concentration profiles of individual components on both sides of the membrane (inaccessible in experiments). Furthermore, the model enabled the evaluation of the mass transport coefficients of the gases in the mixture under varying stream flow rates and arrangements with respect to the membrane separation cell size. Therefore, the possibility of scale-up was discussed for both membranes and flow cell arrangement. Although the mathematical model was developed for a flat sheet membrane configuration, the results can be applied for a real spiral wound module with a wider surface.
Plný tet: SKMBT_C22017112810150 - PDF Plný text: content.csg - PDF
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Comparison of Membrane Materials for Biogas Purification.
Sedláková, Zuzana ; Kárászová, Magda ; Morávková, Lenka ; Vejražka, Jiří ; Izák, Pavel
The aim of this study is the comparison of different membrane material for biogas separation. The comparison is based on the both our experimental results and found literature data for the binary mixtures containing methane and carbon dioxide. The compared membrane materials cover both flat sheet membranes (ethylene-octene copolymer membranes, elastomeric block co-polyamide membranes, water swollen thin film composite membranes, ionic liquid membranes and mixed membrane matrix and hollow fibre modules (polyacrylonitrile PAN hollow fibre coated by Pebax.
Plný tet: SKMBT_C22016090211362 - PDF Plný text: content.csg - PDF
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