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Cristallisation d'hydrates de cyclopentane en présence de l'eau salée et de dioxyde de carbone pour le traitement et le dessalement de l'eau

Abstract : This thesis is an effort to fulfill the gap in the literature on cyclopentane (CP) hydrates for desalination and water treatment applications. Accordingly, it begins with a comprehensive review on Cyclopentane hydrates for hydrate-based treatment processes. This literature work covers all aspects of thermodynamics, kinetics, morphology, hydrate phase properties, and the recent use of Cyclopentane hydrates in desalting process that require to develop an advanced and sustainable technique via hydrate crystallization. Some challenges to overcome in the long term, and critical perspective suggestions are also addressed. A short conclusion is that cyclopentane hydrates, with additives, could be a candidate for desalination. Then, new thermodynamic equilibrium of cyclopentane hydrates are provided, in pure water and in presence of different electrolyte systems including NaCl, KCl, NaCl-KCl, CaCl2, MgCl2, MgCl2-NaCl, MgCl2-NaCl-KCl, or Na2SO4. Results have been modelled with four approaches. The first is based on the standard freezing point depression (SFPD) equation. The second is based on Hu-Lee-Sum (HLS) correlation. The two others are based on van de Waals and Platteeuw model: either with the use of Kihara potential, or a simple correlation between water activity and the hydrate stoichiometry. The last one simulates the experimental results within 0.2°C uncertainty. Moreover, salt crystallization has been achieved, opening the possibility for product recovery with hydrate crystallization.Besides, the crystallization mechanisms, crystals growth rates, and morphology of cyclopentane hydrates crystals in pure water and in the presence of various salts (NaCl, NaCl-MgCl2, NaCl-KCl-MgCl2, or Na2SO4) have also been studied. A non-agitated reactor cell, connected to a microscope, has been employed, as well as different experimental conditions (subcooling and salinity).Finally, equilibrium data of binary CP+CO2 hydrates in pure water and in the presence of three electrolyte solutions (KCl, NaCl, and NaCl-KCl) are provided. Such results are interesting in the development of combined hydrate-based desalination and CO2 capture. Accordingly, an isochoric method is applied in a batch-mode reactor. A thermodynamic simulation tool based on van der Waals and Platteeuw approach and Kihara potential approach is utilized to reproduce equilibrium.
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Son Ho Van. Cristallisation d'hydrates de cyclopentane en présence de l'eau salée et de dioxyde de carbone pour le traitement et le dessalement de l'eau. Other. Université de Lyon, 2019. English. ⟨NNT : 2019LYSEM019⟩. ⟨tel-02949575⟩

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