Thermodynamic study of solid-liquid-vapor equilibrium : application to cryogenics and air separation unit

Abstract : In the framework of the cryogenic air separation, impurities such as CO2 and N2O may solidify at the reboiler-condenser placed between the two distillation columns.The formed solid could provide an additional strength to the heat and material transfers, and increase the pressure drops in the distillation columns.Furthermore, the presence of a solid phase can promote the accumulation of light hydrocarbons which may form flammable mixtures with liquid oxygen.Therefore, the presence of solid phases must be controlled see avoided within the cryogenic air distillation process.The main issue of this thesis is to develop a suitable model for representing solid phases and their equilibrium with the liquid and vapor phases at the operating conditions of the process, and to obtain full phase diagrams which would improve the knowledge of phase equilibria and the control of the risks associated to the presence of solid phases.
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Marco Campestrini. Thermodynamic study of solid-liquid-vapor equilibrium : application to cryogenics and air separation unit. Chemical and Process Engineering. Ecole Nationale Supérieure des Mines de Paris, 2014. English. ⟨NNT : 2014ENMP0035⟩. ⟨tel-01139406⟩

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