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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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11.2 Operating Effects on Costs

We can use the methods developed in Chapters 4, 6, and 7 to calculate the number of equilibrium stages, Nequil, required. Then Nactual = Nequil/Eo. The height of a staged column is

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(11-13)

The column diameter is found using the methods in Chapter 10. Equation (10-16) shows that for higher pressures the diameter will be somewhat reduced. Conversely, for vacuum operation the diameter will be increased. Increases in tray spacing increase Csb, flood, which also increases uop, and thus, the diameter will decrease while the column height increases.

As L/D → ∞ (total reflux), the number of stages approaches a minimum ...

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