Étude des mécanismes de transferts des solutés neutres et chargés en nanofiltration dans des milieux hydro-alcooliques

Abstract : The extraction of bio-molecules from renewable resources is emerging as one of a key topics in the fields of biotechnology, cosmetology and pharmacy. To minimize the organic solvent consumption, as well as to increase the efficiency, extraction by water/alcohol mixtures appears to be a promising approach. Moreover, additional purification and concentration steps are generally required to enrich the medium with the target molecules. Nanofiltration is a de-facto separation technique for such operations because it is clean, sober and safe. Unfortunately, there is few literature on the transfer of water/ethanol mixtures regarding nanofiltration. This study aims to better understand the transfer mechanisms that govern selectivity in these media. At the first step, a fundamental study is realized on nanofiltration in water/alcohol mixtures alone or with the presence of neutral or charged solutes. The obtained results show that when the alcohol content increases, the membrane is swelling, the pore radius increases but the intrinsic resistance is still constant. The well-known transfer mechanisms in aqueous media (steric exclusion, electric interaction, dielectric interaction) and in organic media (hydrophobic interaction, affinity solute-membrane-solvent) are all present in the water/alcohol mixtures, but relative intensity appears to be different. Different models (Spiegler-Kedem & Film, Hydrodynamics & Film, Solution-Diffusion & Film, Pore-Flow & Film, Electric Steric and Dielectric Exclusion) were used to model the retentions and estimate the transfer parameters.
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Thi Vi Na Nguyen. Étude des mécanismes de transferts des solutés neutres et chargés en nanofiltration dans des milieux hydro-alcooliques. Génie chimique. Université Rennes 1, 2018. Français. ⟨NNT : 2018REN1S100⟩. ⟨tel-02178702⟩

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