Efficiency of dualflow trays in distillation
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The mass transfer efficiencies of dualflow trays with open hole areas of 20, 28 and 37% were experimentally investigated under total reflux conditions in a 300-mm diameter distillation column using methanol-water and methanol-isopropanol systems. The results indicate that the efficiency of a dualflow tray is a strong function of the open hole area, the vapor/liquid load, and liquid properties such as surface tension and density. A fundamental model was developed to predict tray efficiency. The prediction was found to agree with the measured data to within 15.3%.
L'efficacite du transfert de matiere dans les plateaux a ecoulement double avec des zones d'orifices ouvertes de 20, 28 et 37% a ete etudiee experimentalement dans des conditions de reflux totales dam une colonne de distillation de 300 mm de diametre avec des systemes methanol-eau et methanol-isopropanol. Les resultats indiquent que I'efficacite d'un plateau a ecoulement double est fortement fonction de la zone d'orifice ouverte, de la charge liquide/vapeur et des proprietes du liquide telles que, la tension superficielle et la masse volumique. On a mis au point un modele fondamental pour la prediction de I'efficacite des plateaux. On a trouve que cette prediction concordait avec les donnees mesurees a 15,3%.
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