Chemical Engineering > GATE 2013 > Distillation
The vapor-liquid equilibrium curve of a binary mixture A-B, may be approximated by a linear equation over a narrow range of liquid mole fractions (0.2A<0.3) as follows y*A=1.325 xA+0.121. Here y*A is the mole fraction of A in the vapor. 100 moles of a feed (xA,F=0.28) is batch distilled to a final residue (xA,W=0.2). Using the Rayleigh equation, the number of moles of the residue left behind in the distillation unit, up to 2 digits after the decimal point, is
Correct : 39.42
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