Contribution à l'étude des propriétés thermodynamiques des solutions très concentrées d'acétate de potassium en solvant aqueux et mixte : extension aux carboxylates de potassium

Abstract : Electrolytes can be found in biology, as weil as chemical engineering and environmental science in the form of polluting meters or as biosphere components. The description of thermodynamic properties of electrolyte solutions in aqueous or mixed solvents is critical in various separation processes, including crystallization or distillation. Therefore, the study of such systems is of great interest form a theoretical and industrial point of view. Due to a lack of experimental data, very few researches on potassium acetate lead to actual industrial applications. This work is a contribution to the experimental determination of thermodynamic properties of potassium acetate solutions in aqueous or mixed solvent and to their representation. We have measured liquidlsolid equilibrium thanks to an experimental deviee designed in the laboratory. We have used a C80 calorimeter (SETARAM) for the determination of dissolution enthalpies in water and in water/ethanol mixed solvents at several temperatures. Eventually, we have measured the molar volumes of solutions with a DMA 601 densitometer (ANTON PAAR) This thermodynamic properties representation was obtained with Pitzer and Chen models. This work provides a methodological approachfor study of highly soluble salts, and shows the importance of calorimetrie data for parame ter fitting of thermodynamic models.
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Christophe Nicolas. Contribution à l'étude des propriétés thermodynamiques des solutions très concentrées d'acétate de potassium en solvant aqueux et mixte : extension aux carboxylates de potassium. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2002. Français. ⟨NNT : 2002INPL051N⟩. ⟨tel-01749774⟩

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