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Étude des phénomènes d'agrégation moléculaire dans les bruts pétroliers

Abstract : The objective of this study was to propose methods of characterization of the crude oils, making it possible to evaluating the risks of asphaltenes flocculation. With this view, we have used four experimental techniques: densimetry, inverse gas chromatography, dynamic light scattering and differential scanning calorimetry allowing to assess necessary thermodynamic and structural properties of crude oils. The firts two techniques brought a thermodynamic characterization of the crude oils, while following ones made it possible to characterize the structures of the crude oils and the aggregates asphaltenic. We have proposed a new method to determine asphaltenes flocculation onset based on the changes of the crude oils density implied by the flocculation process. Inverse chromatography allowed to determine the Hildebrand solubility parameter of crude oil and asphaltenes and to obtain the chemical characterization of them in terms of LSER paramters. Calorimetry and light scattering results gave valuable insight into variation of the colloidal structure of the crude oil with temperature and composition changes.
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Gédéon Ekulu Ndiakama. Étude des phénomènes d'agrégation moléculaire dans les bruts pétroliers. Autre. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ007S⟩. ⟨tel-01752435⟩

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