Estimate the position of the feed point for the separation considered in Example 11.3, for a reflux ratio of 3.

Data from Example 11.3

Estimate the minimum number of ideal stages needed in the butane-pentane splitter defined by the compositions given in the table below. The column will operate at a pressure of 8.3 bar. Evaluate the effect of changes in reflux ratio on the number of stages required. This is an example of the application of the Erbar-Maddox method. The feed is at its boiling point.

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Propane, C3 i-Butane, iC4 n-Butane, nC4 i-Pentane, iC5 n-Pentane, nC5 Feed (f) 5 15 25 20 35 100 Distillate (d) 5 15 24 1 0 45 Bottoms (b) 0 0 1 19 35 55 kmol