Process Equipment and Plant Design
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

McCabe-Thiele's method
Sorel-Lewis method
Ponchon-Savarit method
None of these

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Both the functions of condensation & sub cooling are carried out in a single unit
Hydrostatic head is required for refluxing the condensate
Only the function of condensation is to be carried out
Sub cooling of condensate is desired

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