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The point where the operating line and the...

The point where the operating line and the equilibrium line meets in distillation methods is known as

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asked Sep 21, 2022 in Mass Transfer by Julian (38.2k points)

The point where the operating line and the equilibrium line meets in distillation methods is known as

(a) Plait point

(b) Q point

(c) Pinch point

(d) None of the mentioned

I had been asked this question during a job interview.

My question is from Flash Vaporization Line (q-line) topic in chapter Distillation of Mass Transfer

mass transfer
distillation
flash vaporization line (q-line)

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answered Oct 13, 2022 by Chris (39.8k points)

Right answer is (c) Pinch point

To explain: At the pinch point, separation is not possible since it requires an infinite number of trays in the enriching section if operating and equilibrium line meets.

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