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A distillation column has a feed of 100 kmol/h. The feed is 15 mol% heavy non-key,...

A distillation column has a feed of 100 kmol/h. The feed is 15 mol% heavy non-key, 35 mol% heavy key, and 50 mol% light key. The reflux ratio is 1.4 times the minimum. It is desired to have 99% recovery of the light key in the distillate. The mole fraction of light key in the distillate should be 0.85. Use the FUG approach to determine the number of ideal stages required. Equilibrium data:
aLNK =3.5
aLK =1.5
aHK =0.85

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