Two Models of Feed Tray

So the distillation process in two-section column may be feasible, it is necessary that sections trajectories are joined with each other (i.e., that there is material balance between sections flows at the plates above and below feed cross-section). 

The mixture of two flows of liquid goes into the plate, located below feed cross-section the hquid part of feeding and of liquid, following down from top section bottom plate (Fig. 5.29a). Therefore, between liquid leaving top section and liquid going into bottom section, there is a leap of concentrations in accordance with the equation of material balance in feed cross-section  

The simplified model of feed tray, based on the assumption that feed plate is common for both sections and that the process of mixing and the process of equilibrium achievement go on simultaneously (Fig. 5.29b), is used in a number of works (Levy et al., 1985 Julka Doherty, 1990). According to this model, the composition x/ can be determined from the equations of both sections (i.e., point Xf should lie at the intersection of two sections trajectories) (x/ e Regf 

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