where:
Ebnxn b b fm i Un is the ratio of the light key to the heavy key in the stripping pinch, is the ratio of the light key to the heavy key in the upper pinch, is the summation of bmaxm for all components heavier than the heavy key in the lower pinch, is the summation of bnxn for all components lighter than the light key in the upper pinch, and are the factors shown in Figure 11.41.
Example 11.15
A mixture of n-C4 to n-C7 hydrocarbons is to be distilled to give top and bottom products as follows. The distillation is effected at 800 kN/m2 and the feed is at 372 K. The equilibrium values, K, are shown in Figure 11.39. It is required to find the minimum reflux ratio. No cooling occurs in the condenser.
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