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Find the ratio of distillate to residual flow rates, if a binary mixture containing 65% of more volatile component while the distillate and the residue compositions are 90% and 30%.

(a) 0.4

(b) 1.4

(c) 2.4

(d) 3.4

I had been asked this question in homework.

This key question is from Distillation topic in section Distillation of Mass Transfer

1 Answer

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by (39.8k points)
Correct choice is (c) 2.4

The best explanation: -W/D=(xd – xf)/(xw-xf)

Finally we ger –W/D= -0.416

D/W= 2.4.

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