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Valorisation du biogaz par purification et par reformage

Abstract : The present work is focused on biogas valorization. Two innovative processes were investigated in order to obtain bio-methane. The first one is CO2 absorption into an emulsion where some organic phases are responsible for an improvement of the mass transfer. Among the product tested, octanol and toluene proved to be efficient for carbon dioxide absorption even if the liquid side volumetric mass transfer coefficient did not show important variations. Experiments showed that according to the interfacial properties of the system, the dispersed phase can spread over the gas bubbles and be involved in the transfer directly. The second process considered is a micro-structured device displaying excellent mass transfer characteristics. Initially designed for the mixing of fluids, the IMM Caterpillar micro-mixer, proved to be an efficient absorption device with liquid side volumetric mass transfer coefficients up to 0.5 s-1 The second option is the production of syngas by direct reforming of the biogas. The dry methane reforming was extensively studied during the past few years since it can convert two greenhouse gases into valuable products for the chemical industries. A 1 mm side square channel reactor was designed in order to investigate the reaction. Results showed that a total reactant conversion could be achieved with a minimum temperature of 700°C and a maximum volumetric flowrate of 45 mL/min. The influence of feed composition was also assessed: a stoichiometric ratio is ideal for the reaction
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Tarsida Nicolas Wedraogo. Valorisation du biogaz par purification et par reformage. Alimentation et Nutrition. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0190⟩. ⟨tel-01751148⟩

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