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In batch distillation, with constant reflux overhead product composition

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In batch distillation, with constant reflux overhead product composition

(a) Increases with time

(b) Decreases with time

(c) Does not vary with time

(d) Does vary with time

This question was posed to me by my school principal while I was bunking the class.

This question is from Minimum Reflux for System Containing Distributed Monkeys in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

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Correct answer is (b) Decreases with time

Easy explanation: As batch operation feed reduces with given time thus reflux decreases, as batch distillation contains a limited amount of feed.

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