Trajectories of the Finite Columns and Their Design Calculation

Trajectories of the Finite Columns and Their Design Calculation 

In this chapter, we turn from infinite columns to real finite columns. On the basis of the analysis performed previously for infinite columns, we determine the regularities of location of finite columns trajectories in the concentration simplex and, in particular, the regularities of joining of finite column section trajectories. This will allow us to develop simple and reliable algorithms of distillation design calculation. 

Among these methods, the modification that was named inside-out (Russel, 1983) is the most widely used. 

But the existing methods of distillation calculation (simulating methods) are poorly adapted to designing. They do not answer essential questions, such as (1) is the set split feasible (2) which minimum reflux number is necessary to ensure the set split and (3) which numbers of the trays in column sections are sufficient to ensure the set split  

Therefore, the answers to these questions are being looked for in the dark, setting tray numbers in column sections at random. 

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