The vapor-liquid equilibrium data for heptane – ethylbenzene at 1 atm pressure is given below: 0.10 0.20 0.40 0.50 0.60 0.70 0.90 0.25 0.45 0.65 0.74 0.82 0.86 0.96 1 A feed mixture containing 40 mol% heptane and 60 mol% ethylbenzene is to be fractionated at 1 atm pressure to produce a distillate containing 95 mol% heptane and a bottom product stream containing 96 mol% ethylbenzene. Latent heat, kJ/kmol Heat capacity, kJ/kmol-K www www Heptane 35,000 220 Ethylbenzene 40,000 183 Feed temperature Condenser temperature 30°C 95°C Reboiler temperature 99°C For a saturated vapor feed and a reflux ratio that is twice the minimum, determine: a. the number of theoretical stages using the McCabe-Thiele graphical method b. the optimum feed stage location the actual number of stages if the efficiency is 60% с.

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