A 50 mol% mixture of acetone in isopropanol is to be distilled to produce a distillate of 80 mol% acetone and a bottoms of 25 mol%. The feed is a saturated liquid, the column is operated with a reflux ratio of 0.5, and the Murphree vapor efficiency is 50%. How many trays are required? Assume a total condenser, partial reboiler, saturated- liquid reflux, and optimal feed stage. The vapor–liquid equilibrium data are:

Transcribed Image Text:

EQUILIBRIUM DATA, MOLE- PERCENT ACETONE 11.7 20.7 29.7 34.1 44.0 52.0 0 8.9 17.4 31.5 45.6 55.7 60.1 68.7 74.3 Liquid 0 2.6 5.4 Vapor Liquid 63.9 74.6 80.3 86.5 90.2 92.5 95.7 Vapor 81.5 87.0 89.4 92.3 94.2 95.5 97.4 100.0 100.0