Use the Fenske-Underwood-Gilliland shortcut method to determine the reflux ratio required to conduct the distillation operation indicated in figure if NI Nmin = 2.0, the average relative volatility = 1.11, and the feed is at the bubble-point temperature at column feed-stage 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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Distillate kmol/h Propylene 347.5 Propane Feed Distillation 3.5 kmol/h 351.0 Propylene Propane 360 Bottoms 240 600 Figure 9.25 Data for Exercise 9.13.