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If the flow rates of liquid and distillate are 150 kmol/h and 100 kmol/h. Find reflux ratio?

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If the flow rates of liquid and distillate are 150 kmol/h and 100 kmol/h. Find reflux ratio?

(a) 90

(b) 50

(c) 15

(d) 30

This question was posed to me during an internship interview.

The origin of the question is Minimum Reflux in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

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Correct answer is (c) 15

Easiest explanation: Reflux is given by L/D = 150/100 = 15.

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