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Upgrading of Biogas by Supported Liquid Membranes
Kárászová, Magda ; Vejražka, Jiří ; Veselý, Václav ; Izák, Pavel
The contribution investigate the basic characteristics of the supported ionic liquid membrane consisting of an ionic liquid [Emim] [Tf2N] and the porous support of polyvinylidenflouride. The membrane was performed during permeation into the carrier gas. The permeability of pure gases and mixtures of different composition were investigated. The obtained data were compared with the literature.
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Plný tet: SKMBT_C22013102515210 - PDF
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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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