A mixture of acetone and isopropanol containing 50 mol% acetone is to be distilled continuously to produce an overhead product containing 80 mol% acetone and a bottoms containing 25 mol% acetone. If a saturated-liquid feed is employed, if the column is operated with a reflux ratio of 0.5, and if the Murphree vapor efficiency is 50%, how many trays will be required? Assume a total condenser, partial reboiler, saturated-liquid reflux, and optimal feed stage. The vapor-liquid equilibrium data for this systemare

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EQUILIBRIUM DATA, MOLE-PERCENT ACETONE |Liquid Vapor Liquid 5.4 11.7 20.7 29.7 55.7 34.1 44.0 52.0 2.6 8.9 17.4 31.5 45.6 60.1 68.7 74.3 80.3 92.5 74.6 86.5 95.7 100.0 63.9 90.2 Vapor 89.4 94.2 81.5 87.0 92.3 95.5 97.4 100.0