National Repository of Grey Literature 60 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Influence of Surface Treatment of Thin-Film Composite Membrane on Separation of Carbon Dioxide from Biogas.
Morávková, Lenka ; Kárászová, Magda ; Petrusová, Zuzana ; Izák, Pavel
The effect of the various wetting procedure on the membrane performance was studied [1]. Spraying is clearly more efficient than spreading water on the top of the membrane with a brush and results in higher methane purity. Spraying ensures a more uniform distribution of the water on the skin layer of the membrane, leading to much higher CO2 permeation through the membrane and higher CH4 content in the retentate stream.
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The Influence of Surface Treatment and Activation of Thin Film Composite Membranes with Plasma Discharge and Determination of Their Physicochemical Properties.
Slepička, P. ; Setničková, Kateřina ; Petrusová, Zuzana ; Slepičková-Kasálková, N. ; Kolská, Z. ; Siegel, J. ; Jansen, J. C. ; Esposito, E. ; Fuoco, A. ; Švorčík, V. ; Izák, Pavel
In this work we have focused on the surface treatment and activation of membranes (73 AC and 82 V) with plasma discharge and determination of their physicochemical properties. The surface morphology, wettability, zeta potential of pristine and plasma- treated membranes were tested and compared.
Novel materials for membrane gas separation
Giel, Verena ; Pientka, Zbyněk (advisor) ; Izák, Pavel (referee) ; Vopička, Ondřej (referee)
The implementation of polymer membranes in gas separation applications has been investigated to a great extent. Nevertheless, only a few types of polymers are used in commercial applications, disclosing the need for new materials with superior membrane performance to make membrane processes a more competitive technology over the conventional ones. Based on this context, this work focuses on the development of new polymeric membranes. Polyaniline (PANI), a multifaceted polymer that can change its structural properties upon various modification procedures, was chosen as membrane material. PANI membranes possess attractive O2/N2 selectivities, wherefore it is an interesting candidate for the use in gas separation applications, such as generation of oxygen-enriched air or inert gas generation. However, membranes made from neat PANI are suffering from brittleness and thus create leak paths through the membrane. Therefore PANI was blended with polybenzimidazole (PBI), a temperature stable polymer with good film-forming properties facilitating the preparation of thin, stable polymer films. Furthermore, several techniques were investigated including acid-doping, thermal treatment, and addition of titanate nanotubes (TiNTs) to enhance the separation properties. The materials that have been prepared are: 1)...
Pertraction Using Chiral Membranes for Racemic Mixture Separation.
Gaálová, Jana ; Stibor, Ivan ; Cuřínová, Petra ; Izák, Pavel
During pertration experiments we find out, that kinetics of the pertration significantly influence the enantiomer resolution what that facilitated transport is employed.
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Laboratory Separation of Methanol from the Azeotropic Mixture (25 wt% Methanol and 75 wt% trimethylborate.
Gaálová, Jana ; Vojtek, Lukáš ; Izák, Pavel
The work deals with laboratory separation of methanol from the azeotropic mixture (25 wt% methanol and 75 wt% trimethylborate). Four different manufactured membranes were tested. For all except one separation, separation was more or less successful. With PVA 4155-80 / 2871 the separation proceeded with good results, but very slowly, a condition that could increase the reaction rate could be an increase of temperature. Most selective membrane from Sulzer was PDMS 4155 -30/305 R, which separated MeOH with high efficiency and fast enough. The completely opposite effect than pervious membranes had the membrane PDMS 4060, which instead of MeOH separated Trimethylborate.
Ebulliometric and Static Measurement of Total Pressure in the in the Binary Water + Poly(Ethylene Glycol) System.
Pavlíček, Jan ; Bogdanić, Grozdana ; Wichterle, Ivan ; Izák, Pavel
The total pressure of the systems containing water and three different poly(ethylene glycol)s with nominal molecular weights of 1000, 3000 and 6000 g mol-1 was measured isothermally at 303.15, 308.15, 313.15, 323.15, 333.15, 343.15, 353.15 and 363.15, using the improved static apparatus for lower temperatures and ebulliometrically for higher temperatures, covering the concentration range up to 50 wt % of the polymer. The 343.15 K isotherm was measured by both experimental methods, and both showed good continuity and performance. A lot of additional data have been measured but not yet published, which are integrated here together with our recent measurement.
Novel CO2-Selective Blend Membranes Based on Polyvinylalcohol (PVA) and 1-Ethyl-3-Methylimidazolium Dicyanamide ([emim][dca]) Ionic Liquid for Effective CO2/H2 Separation.
Setničková, Kateřina ; Lanč, M. ; Klepič, M. ; Friess, K. ; Izák, Pavel
This study confirms the positive effect of ionic liquid content in neat polymer on mix gas (CO2/H2) separation. The sorption of CO2 increases with increasing content of [emim][dca] in PVA polymer membranes. The sorption of H2 was negligible in all measured membranes even with highest content of [emim][dca] in PVA. All single gas permeation experiments clearly show increasing permeability of CO2 and H2 with increasing content of ionic liquid in studied polymer. During separation of both gasses, the solution diffusion mechanism is applied. Based on these results we can state that with higher content of [emim][dca] in PVA permeability of both gasses and also ideal selectivity increases. This observation shows a potential of IL where is higher sorption of CO2 than in polymer as good separation medium for CO2/H2 separation.
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Regeneration of TFC PA Membrane Used for Permation of Hexane Vapours.
Petrusová, Zuzana ; Morávková, Lenka ; Štefková, V. ; Machanová, Karolina ; Jandová, Věra ; Koštejn, Martin ; Izák, Pavel ; Jansen, J.
This contribution is accomplished by the study of the membrane affinity via contact angle measurements and by structural analysis via electron he transport properties of the TFC PA were studied at various experimental conditions and the obtained results will be discussed.
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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.
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