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Biomethane upgrading process : thermodynamic study of solid-liquid-vapor equilibrium form methane rich mixture

Abstract : In the field of non-fossil energy sources and exploitation of wasted energies, this PhD project aims to improve the availability of the alternative and renewable resource that is the upgraded biogas, also calledbiomethane. A particular type of biogas is here studied: landfill gas, produced in landfills from the anaerobic digestion of wastes. Depending on the final use, landfill gas need to be treated in order to remove impurities and increase the methane content (upgrading). Carbon dioxide (CO2 ), nitrogen (N2 ) and oxygen (O2 ) need thus to be separated from methane. Because upgrading process is fundamental for further applications of the landfill gas, suitable separationtechniques have to be studied. The objective of the thesis is the study and simulation of an optimized cryogenic technology applied to a landfill upgrading process. The base of the study is the knowledge of the thermodynamic behavior of mixtures constituted of methane and minor compositions of N2 , O2 andCO2 . At this purpose, thermodynamic model will be developed for determining the phase diagrams of methane with the other gases present in the landfill gas. Moreover, in order to validate and calibrate the thermodynamic models, phase equilibrium data involving a CO2 solid phase are needed: an extended bibliographic research on existing data is performed and original measurements are provided where data from literature are missing.
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Submitted on : Tuesday, January 4, 2022 - 2:32:28 PM
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2016PSLEM098_archivage.pdf
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  • HAL Id : tel-03510271, version 1

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Mauro Riva. Biomethane upgrading process : thermodynamic study of solid-liquid-vapor equilibrium form methane rich mixture. Chemical and Process Engineering. Université Paris sciences et lettres, 2016. English. ⟨NNT : 2016PSLEM098⟩. ⟨tel-03510271⟩

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