Question

At what feed condition the slope of the flash vaporization line becomes 0?

(a) Saturated vapour

(b) Saturated liquid

(c) Superheated vapour

(d) None of the mentioned

This question was posed to me in a dream while sleeping

The question is from Flash Vaporization Line (q-line) in section Distillation of Mass Transfer

Answer 1

Right choice is (a) Saturated vapour

To elaborate: For a saturated vapour, the enthalpy of feed and the enthalpy of vapour is same so the value of q= 0; slope of q-line is 0.