Contribution à la thermodynamique de l'absorption des gaz acides H2S et CO2 dans les solvants eau-alcanolamine-méthanol : mesures expérimentales et modélisation

Abstract : This work is related to the development of new processes about gas sweetening with hybrid solvents coupling a chemical one (aqueous solution of diethanolamine) with a physical one (methanol). In the liquid phase, CO2 and H2S react with diethanolamine so that the VLE description of these systems is quite complex and requires experimental data. The first part of this work is dedicated to the experimental determination of acid gases + hybrid solvent solubility data. The experimental apparatus was improved to study H2S solubility and CO2 + H2S mixtures solubility in water-diethanolamine-methanol solvents. In the second part, the simultaneous representation of chemical and phase equilibria was realised. The heterogeneous approach developed here combines the Peng-Robinson equation of state for the vapour phase with the Electrolyte-NRTL model for the liquid phase. Parameters are fitted gradually so that the entire system water-diethanolamine-methanol-CO2-H2S system is extrapolated using Electrolyte-NRTL parameters determined by fitting experimental acid gas partial pressures of lower systems. Methanol effect is also described. An original calculation of heat of absorption was also developed. We extended the use of our approach to study others alkanolamines
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Emilie Blanchon Le Bouhelec Tribouillois. Contribution à la thermodynamique de l'absorption des gaz acides H2S et CO2 dans les solvants eau-alcanolamine-méthanol : mesures expérimentales et modélisation. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL046N⟩. ⟨tel-01752756⟩

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