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EXAMPLE 7.21 (Batch distillation with constant reflux) Forty kilomoles of an equimolar mixture of benzene and chlorobenzene is to be batch-distilled at 1 atm total pressure in a column consisting of a stillpot, two ideal trays and a total condenser. Reflux is returned to the top tray as a saturated liquid and the reflux ratio is 1.0. Distillation is to be continued until the benzene concentration of the liquid in the stillpot becomes 6 mol%. Calculate the amount and purity of the collected distillate, the amount of liquid left in the stillpot, and the fractional recovery of benzene. Liquid holdup on the trays is assumed to be rather small. Vapour-liquid equilibrium data for the system are given below. x 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0 y 0 0.314 0.508 0.640 0.734 0.806 0.862 0.905 0.943 1.0

          EXAMPLE 7.21 (Batch distillation with constant reflux) Forty kilomoles of an equimolar
mixture of benzene and chlorobenzene is to be batch-distilled at 1 atm total pressure in a column
consisting of a stillpot, two ideal trays and a total condenser. Reflux is returned to the top tray
as a saturated liquid and the reflux ratio is 1.0. Distillation is to be continued until the benzene
concentration of the liquid in the stillpot becomes 6 mol%. Calculate the amount and purity of
the collected distillate, the amount of liquid left in the stillpot, and the fractional recovery of
benzene. Liquid holdup on the trays is assumed to be rather small. Vapour-liquid equilibrium data
for the system are given below.
x 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0
y 0 0.314 0.508 0.640 0.734 0.806 0.862 0.905 0.943 1.0

example 721 batch distillation with constant reflux forty kilomoles of an equimolar mixture of benzene and chlorobenzene is to be batch distilled at 1 atm total pressure in a column consisti 55467

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