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Calculate Boil up? If vapor flow and bottom withdrawal are 237.3 and 120.9 respectively

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Calculate Boil up? If vapor flow and bottom withdrawal are 237.3 and 120.9 respectively

(a) 1.5

(b) 2.9

(c) 2.111

(d) 1.963

I have been asked this question during an internship interview.

My doubt stems from Mccabe Thiele Diagram-Construction in section Key Fractionation Concepts of Distillation Design

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Right answer is (d) 1.963

The explanation is: As boil up is ratio of vapor flow and bottom withdrawal then 237.3/120.9 = 1.963.

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