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Abstract
In this analysis, based on the bubble point method, a physical model wasestablished clarifying the interactions (mass and heat) between the species present in thestreams in circulation in the column. In order to identify the externally controlled operatingparameters, the degree of freedom of the column was determined by using Gibbs phase rule.The mathematical model converted to Fortran code and based on the principles of: 1) Globaland local mass conservation balance, 2) Enthalpy balance, and 3) Vapour-liquid equilibriumat each tray, was used to simulate the behavior of the column, concentration distributions,temperature and streams for each phase along the column at high pressure in each tray. Theenergy consumption at the condenser and the boiler was also evaluated using the Starlingequation of state.
Highlights
Numerous methods are cited in the literature regarding the resolution of the complex mixtures distillation problem
Other light components are combined with the light key component according to the vapour-liquid equilibrium constants K
This remark cannot be applied for strongly non ideal complex mixtures without introducing a certain number of errors where distillation with a minimum reflux exhibits a pinching point in the two sections of the column [7]
Summary
Numerous methods are cited in the literature regarding the resolution of the complex mixtures distillation problem. It is clear that the definition of the key component varies from one tray to another according to the values of K. This remark cannot be applied for strongly non ideal complex mixtures without introducing a certain number of errors where distillation with a minimum reflux exhibits a pinching point in the two sections of the column [7]. Reversible distillation of ternary mixtures implies a consequent minimization of the potential difference of transfer (mass and heat) at the tray level This minimization results graphically in the reduction of the difference between the operating line and the equilibrium curve on an x-y diagram
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