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Purification of Flue Gas by Means of Membranes.
Bobák, M. ; Žitková, Andrea ; Vejražka, Jiří ; Červenka, Vojtěch ; Maršálek, J. ; Izák, Pavel
The aim of this work is to test our new patented method of water condensing membrane for flue gas purification. Moreover, our objective is also to compare our unique separation method with polymeric membranes being nowadays developed primarily for carbon capture (CC). Nevertheless, these membranes and whole CC technology have also solve the problem of the other pollutants like SO2, NOx and HX. We would like to find out whether the new separation method could be as efficient as the current polymeric membranes represented by the results of several academic investigations and pilot tests performed by membrane producers. It seems that it would be very advantageous and reasonable to develop the process combining efficient SO2, NOx, HX removal and water recovery but not necessarily with CO2 removal as CC will be possible only on sites where it could be further processed. Thus, there could be also a demand for the efficient technology without CC to be combined with current flue gas purification systems especially on smaller scales.
Fulltext:  PDF
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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.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22017112810150 - PDF
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Purification of Raw Biogas to CNG Quality by Norm 133/2010.
Izák, Pavel ; Žitková, Andrea ; Vejražka, Jiří ; Sedláková, Zuzana ; Morávková, Lenka
Membrane separation processes have recently been increasingly used in the purification of various gases. Their involvement in the processes of upgrading biogas is the logical consequence of this development. The aim of the process is removed from a biogas carbon dioxide and other undesirable substances, eg. sulfur compounds and moisture, and thus obtain a gas with a high proportion of methane (> 95 vol.%), which could be used as a substitute for natural gas. As is evident from the results of our method, the selected RO membrane conforms 133/2010 CNG norm exept the amount of water. The amount of water in the retentate (product) is solved by classical dryer.
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