Publicação
Adsorption of CO2, CH4 and N2 in zeolite 4A Application to Biogas Upgrading
| Resumo: | Biogas is the result of the anaerobic digestion process, and has a promising use in energy generation. Using biogas in energy production is useful not only as a renewable energy source, but also because it captures and uses greenhouse gases (GHG) normally emitted into the atmosphere. However, it is necessary to perform the treatment of biogas, in order to remove certain substances that impair its potential as biofuel, transforming biogas into biomethane. This way, biomethane can be injected into local networks, natural gas (NG), in a city or a central energy production, whereas there is also the possibility of it is respectively compressed or liquefied bio-CNG or bio-LNG for use as carrier biofuel. Several techniques are used for biogas purification, which will be described below, dealing with special emphasis on Pressure Swing Adsorption (PSA) technique that uses porous solids, because the dissertation is directed to this technology. In this work, adsorption equilibrium studies were performed on Binderless Zeolite 4A (provided by the German company Chemiewerk Bad Köstritz), by frontal gas chromatography, for pure components CO2, CH4 and N2. The studies were performed through breakthrough experiments at temperatures of 313, 373 and 423 K, and partial pressures in the range of 0.30 to 4.15 bar and total pressures between 1 and 5 bar. The isotherms of CO2 obtained experimentally were modelled using the Langmuir model. Regarding CO2 at the temperature of 313 K, and for 0,31 bar of partial pressure the adsorbed amount is 2,178 mol/kg and for a partial pressure of 4,15 bar is 3,569 mol/kg. In the case of CH4 and N2 it was not possible to measure the isotherms, because the results obtained are very inconclusive since mass transfer of this components is very low. |
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| Autores principais: | Lopes, Carlos Manuel |
| Ano: | 2016 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | Biogas is the result of the anaerobic digestion process, and has a promising use in energy generation. Using biogas in energy production is useful not only as a renewable energy source, but also because it captures and uses greenhouse gases (GHG) normally emitted into the atmosphere. However, it is necessary to perform the treatment of biogas, in order to remove certain substances that impair its potential as biofuel, transforming biogas into biomethane. This way, biomethane can be injected into local networks, natural gas (NG), in a city or a central energy production, whereas there is also the possibility of it is respectively compressed or liquefied bio-CNG or bio-LNG for use as carrier biofuel. Several techniques are used for biogas purification, which will be described below, dealing with special emphasis on Pressure Swing Adsorption (PSA) technique that uses porous solids, because the dissertation is directed to this technology. In this work, adsorption equilibrium studies were performed on Binderless Zeolite 4A (provided by the German company Chemiewerk Bad Köstritz), by frontal gas chromatography, for pure components CO2, CH4 and N2. The studies were performed through breakthrough experiments at temperatures of 313, 373 and 423 K, and partial pressures in the range of 0.30 to 4.15 bar and total pressures between 1 and 5 bar. The isotherms of CO2 obtained experimentally were modelled using the Langmuir model. Regarding CO2 at the temperature of 313 K, and for 0,31 bar of partial pressure the adsorbed amount is 2,178 mol/kg and for a partial pressure of 4,15 bar is 3,569 mol/kg. In the case of CH4 and N2 it was not possible to measure the isotherms, because the results obtained are very inconclusive since mass transfer of this components is very low. |
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