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What is Q in McCabe Thiele method?

(a) Mole fraction of liquid in the feed

(b) Concentration

(c) Viscosity

(d) Temperature

This question was posed to me during an internship interview.

Asked question is from Distillation of Binary Mixtures in section Distillation of Food Processing Unit Operations

1 Answer

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Right choice is (a) Mole fraction of liquid in the feed

To elaborate: The parameter q is known to be mole fraction of liquid in the feed and the typical McCabe-Thiele diagram uses a q-line which represents partially vaporized feed.

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