Article Dans Une Revue Separation and Purification Technology Année : 2025

Evaluation of nine candidate absorbents for VOC removal in biogas upgrading : Experimental and theoretical study

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Biogas is a promising energy source that could replace non-renewable, polluting energy. However, some impurities, including carbon dioxide, hydrogen sulfide, and especially various volatile organic compounds (VOCs), should be removed prior to end-use. In this work, nine solvents were evaluated for the first time for their potential to capture six VOCs found as biogas impurities. The vapor-liquid partition coefficients (K) of the six VOCs in the nine solvents were determined using static headspace-gas chromatography. Conductor-like Screening Model for Real Solvents (COSMO-RS) and quantum chemical calculations were used to analyze the intermolecular interactions between absorbents and VOCs. Diethylene glycol dibutyl ether was found to be the best performing absorbent for hydrophobic VOCs with K value up to 62,295 times lower than that of water in the case of decamethyltetrasiloxane. The selected absorbents maintained high VOC absorption capacity of > 98 % over ten absorption-desorption cycles, demonstrating their effectiveness and stability. Furthermore, the partition coefficients of VOCs in absorbents were found to be affected by both the free volume of the absorbent and the binding energy of the absorbent-VOC complex. Taken together, the experimental and theoretical results suggest that the studied absorbents are promising alternatives for VOC removal in biogas upgrading processes.

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hal-05102834 , version 1 (07-06-2025)

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Abbas Ahmad Kassem, Chengmin Gui, Zhigang Lei, Jaouad Zemmouri, Sophie Fourmentin. Evaluation of nine candidate absorbents for VOC removal in biogas upgrading : Experimental and theoretical study. Separation and Purification Technology, 2025, 375, pp.133865. ⟨10.1016/j.seppur.2025.133865⟩. ⟨hal-05102834⟩
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