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Thin Film Composite Membrane for Effective Raw Biogas Upgrading to Pipeline Quality Methane
Kárászová, Magda ; Vejražka, Jiří ; Veselý, Václav ; Friess, K. ; Randová, A. ; Jansen, J. C. ; Izák, Pavel
In this contribution we propose a method to upgrade biogas to the same quality of fuel standard natural gas. The latter contains more than 95 vol. % of methane. Using traditional membranes, such concentration of methane in the retentate could only be achieved using a multistep process. A recently proposed method for raw biogas purification from impurities and carbon dioxide by condensing water on swollen thin film composite membranes was found to be highly effective. The hydrophilic reverse osmosis membrane promotes the formation of a very thin selective water layer under condensing conditions below the dew point of the raw biogas feed. The large difference in permeability of the impurities in raw biogas (carbon dioxide, hydrogen sulfide) and methane through the water layer enables upgrading of raw biogas to biomethane quality in a single stage. Contrary to the classical purification processes, the proposed method does not require any biogas pretreatment, which makes this approach economically attractive. It represents an innovative approach to production of biomethane from biogas.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22012102413470 - PDF
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Separation of Carbon Dioxide from Methane by Ionic Liquid Membrane
Kárászová, Magda ; Izák, Pavel
Work deals with ionic liquid membranes for separation of carbon dioxide and methane. Main advantage of ionic liquid is negligible vapor pressure and low chemical reactivity. [1]. Selectivity of liquid membranes is given by different solubility of separated gases in chosen liquid. Carbon dioxide is twenty times more soluble in used ionic liquid than methane. Membrane used for separation consisted of porous PVDF and ionic liquid [emim][Tf2N]. Permeability of pure gases and model mixtures through the membrane was tested. Ideal selectivity of the membranes for CO2/CH4 mixture was found to be 22. Permeability of pure gases does was only about 10% higher than permeability of mixed gases. The membrane may be applied for purification of biogas.
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Purification of Biogas by Means of Membranes
Poloncarzová, Magda ; Vejražka, Jiří ; Izák, Pavel
The aim of this work is to find a way to lower carbon dioxide concentration in biogas and to purify it from undesirable gases by means of membrane. Ideally only one or two steps should be used to make the technology feasible and profitable. Liquid membranes are used because of their high selectivity and good permeability. Successful biogas purification method would open new opportunities in ecological fuels, especially if the methane content in biogas reached more than 95%; biogas could then replace the natural gas. In this work, a new supported ionic liquid has been tested and the first results have been obtained. Sweeping gas permeation was performed with model mixture of CO2 and CH4 1:1.
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Sorption Characteristics of PDMS in Ternary Systems Benzene (1) + Alcohols (2) + Ionic Liquid (3) and Corresponding Binary Subsystems
Randová, A. ; Bartovská, L. ; Hovorka, Š. ; Friess, K. ; Izák, Pavel
In this work the study of sorption characteristics of PDMS in ternary system benzene (1) + methanol or butanol (2) + ionic liquid (3) and corresponding binary subsystems at the temperature of 20°C is presented. The experimental data on total sorption were determined gravimetrically [3], the experimental data on preferential sorption were evaluated from the concentration change induced by an immersion of the membrane into the liquid mixture [3]. The volume changes of swollen membrane immersed in the studied liquid systems were determined from the dimensional changes of the membrane samples changes in X and Y axis dimensions were monitored directly in liquid by an optical method [1, 3] and membrane sheet thickness was measured by an Inductive Dial Indicator (Mahr, Germany).
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