Poster De Conférence Année : 2024

Potential Kinetic Promoters for CO2/CH4 Separation: IR vs in-situ Raman determinations

Résumé

Biogas, a renewable fuel derived from anaerobic digestion of organic waste, presents a significant potential to decreasing the dependence on fossil fuels. Unlike its non-renewable counterparts, biogas is continuously regenerated and offers a path towards a more sustainable energy production. However, prior to domestic and industrial utilization, biogas requires purification to isolate methane, the primary energy carrier, from carbon dioxide (CO2) and trace components. Conventional CO2 separation techniques often rely on high-pressure operations, hazardous chemicals, or energyintensive processes [1]. Clathrate hydrates offer a safer and potentially more eco-friendly alternative. These water-based crystalline structures can trap methane molecules under slightly different conditions compared to CO2. Interestingly, while hydrates can be a nuisance in oil and gas pipelines, their formation conditions (temperature and pressure) are relatively mild, making them a safer and easier process for biogas upgrading. Recent research suggests that using clathrate hydrates to upgrade biogas mixtures is a promising alternative to traditional methods [2]. This approach could be more economical and sustainable, avoiding the use of hazardous chemicals and making biogas a truly green energy source. Based on a previous paper [3], several promoters are tested depending on their separation factor and occupancy. Promoters used are anionic and zwitterionic surfactants which are demonstrated to affect the hydrate-forming ability of water. Sodium lignin derivatives are also tested. Separation experiments are conducted in the same conditions reported in the work of Di Profio et al., at a starting pressure of 2.5 MPa and 274 K, under pressure-dropping conditions. In that case, a selfassembled IR detector was used to determine the gas mixture composition before and after hydrate formation and dissociation. In the present work, Raman spectroscopy is performed to characterize the formed structures in terms of selectivity for biogas separation and hydrate occupancy under in-situ conditions. Raman quantification factors are used to obtain the relative amount of CH4 and CO2 in the hydrates, while a calibration protocol is applied to derive the relative amount of these molecules in the gas phase before and after the formation of the hydrates. The spectroscopic results relative to the gas composition before and after hydrate formation are discussed and compared with the IR data of reference work. They show the impact of the promoters on the separation ability of clathrate hydrates, which results to be inversely proportional to the amount of gas mixture enclathrated. Bibliography [1] J. Das, H. Ravishankar, P.N.L. Lens. Journal of Environmental Management, 2022, 304, 114198. [2] Q.Le, C.T. Rodriguez, L.N. Legoix, C. Pirim, B.Chazallon. Applied Energy, 2020, 280, 115843. [3] P. Di Profio, V. Canale, N. D’Alessandro, R. Germani, A. Di Crescenzo, A. Fontana. ACS Sustainable Chem. Eng. 2017, 5, 2, 1990–1997

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Dates et versions

hal-04617707 , version 1 (19-06-2024)

Identifiants

  • HAL Id : hal-04617707 , version 1

Citer

Nadia Barbacane, Michele Ciulla, Serena Pilato, Rafal Damain Wolicki, Claire Pirim, et al.. Potential Kinetic Promoters for CO2/CH4 Separation: IR vs in-situ Raman determinations. European Conference on Gas Hydrates 2024, Jun 2024, Trieste (Italy), Italy. . ⟨hal-04617707⟩
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