Mass Transfer · Distillation · 1 mark · Multiple choice
An equimolar benzene–toluene mixture is batch distilled at atmospheric pressure. Benzene mole fraction in all distillate collected after 10 minutes is 0.6. The batch continues for another 10 minutes. Its mole fraction in the total collected distillate after 20 minutes is
Benzene is the more volatile component, so the remaining batch becomes progressively depleted in benzene. The composition of newly collected distillate decreases with time. Material collected in the second interval therefore has a lower benzene fraction than the first interval’s average. Mixing it with the earlier distillate lowers the overall average below 0.6, A.
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