Question

It is desired to design a distillation column to separate Methanol and Ethanol. One must obtain 100 kmol / hr of distillate with a mol concentration of 0.95 from a liquid stream saturated with 35 mol% of methanol. For this purpose, there will be a Reboiler and a total capacitor that can eliminate 12000 Kcal / h (λ = 40Kcal / Kmol), and allows a return flow of saturated reflux to the tower. If the concentration of bottom product should not exceed 5 mol% of methanol.

Determine

a) The kmol / hr of food and funds.

b) The number of theoretical stages required.

c) The optimal location of the feeding plate.

The equilibrium curve for the methanol-ethanol system is given by
the following equation:

y = 4x / (1 + 4x)

Answer #1

Q1) Methanol (50 %) and water (50 %) mixture is fed into a
distillation column. The feed
flowrate is 500 kmole/hr. 50 % of feed is vaporized. The column is
well insulated and has a
total condenser. A reflux is set to 2 and returned to column as
saturated liquid. The compositions
in the distillate and bottom are to be 95 % and 5 %, respectively.
The column is at 1 atm. Instead
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Distillation- McCabe-Thiele
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