Project ForgeMass Transfer
Mass Transfer Operations
GATE 2019
Medium
A binary A-B mixture (αAB=2) is distilled to obtain 95 mol% A as top product from a saturated-liquid feed containing 50 mol% A. The minimum reflux ratio is (rounded off to one decimal place)
1.7(± 0.1 accepted)
Explanation
Saturated liquid feed: q-line vertical at x=0.5, meeting the equilibrium curve at y*=2(0.5)/(1+0.5)=0.667. Rmin/(Rmin+1)=(0.95−0.667)/(0.95−0.5)=0.6296. Rmin=0.6296/0.3704=1.70.
Source: GATE CH 2019 (2019)
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