Question

We wish to separate a mixture of 60 mol% ethanol and 40 mol%
*n*-propanol in a distillation column with a partial
reboiler and a total condenser. The feed rate is 1000 kmol/h, and
feed is a saturated vapour. We desire a distillate product of 99
mol% ethanol and a bottoms product that is 0.8 mol% ethanol. Reflux
is saturated liquid and CMO can be used. Equilibrium data can be
approximated with an average relative volatility of 2.1 (ethanol is
more volatile).

a)Use Underwood equations to find the minimum reflux ratio (Rmin).

b)Use Gilliland correlation to estimate the total number of stages for R = 1.05 x Rmin.

c) Determine the optimum feed stage location for R = 1.05 x Rmin.

Answer #1

Distillation- McCabe-Thiele
A saturated vapor feed (pure vapor at the dew point) containing
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kPa abs. to give a distillate containing 95 mol% toluene at 10
kmol/hr and a bottoms containing 5 mol% toluene. Use McCabe-Thiele
graphical method to answer the following questions:
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