2C + 2N + 5

A more complex unit is shown in Fig. 13-24, which is a schematic diagram of a distillation column with one feed, a total condenser, and a partial reboiler. Dotted lines encircle the six connected elements (or units) that constitute the distillation operation. The variables N" that must be considered in the analysis of the entire process are just the sum of the Nf's for these six elements since here Nr = 0. Using Table 13-5,

Element (or unit)

Total condenser Reflux divider

N - (M + 1) equilibrium stages Feed stage

(M - 1) equilibrium stages Partial reboiler

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