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If distillate is 95%, and withdrawal is 4 and α=2.5. Estimate total number of tray?

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If distillate is 95%, and withdrawal is 4 and α=2.5. Estimate total number of tray?

(a) 7.7

(b) 10

(c) 6.7

(d) 5.7

This question was posed to me in an online quiz.

My query is from Minimum Stages topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design

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Correct choice is (c) 6.7

Explanation: Using Fenske’s equation and subsuming values we have 2.66/log 2.5= 6.7.

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