Use the FUG method to determine the reflux ratio required for the distillation in Figure 9.25 if N/Nmin = 2.0, the average relative volatility = 1.11, and the feed is at the bubble-point temperature at feedstage pressure. Assume that external reflux equals internal reflux at the upper pinch zone. Assume a total condenser and a partial reboiler.

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Feed Propylene Propane kmol/h 360 240 600 Distillation Figure 9.25 Data for Exercise 9.13. Distillate kmol/h Propylene 347.5 Propane 3.5 351.0 Bottoms