Question

A distillation column with a total
condenser is separating acetone from ethanol. A distillate
concentration of xD = 0.90 mole fraction acetone is desired. Since
CMO is valid, L/V = constant. If L/V is equal to 0.8. The
distillation column has a partial reboiler that acts as an
equilibrium contact. If the bottoms composition is x_{B} =
0.13 mole fraction acetone and the boilup ratio V/B= 1.0, find the
vapor composition leaving the second stage above the partial
reboiler.

a) Get the Equilibrium data for acetone and ethanol at 1 atm from any suitable reference.

b) Find the composition of the liquid leaving the fifth stage below the total condenser.

c) The distillation column in parts a and b is separating
acetone from ethanol and has x_{D}= 0.9, x_{B}=
0.13, L/V= 0.8, and V/B= 1.0. If the feed composition is z = 0.3
(all concentrations are mole fraction of more volatile component),
find the optimum feed plate location, total number of stages, and
required q value of the feed.

d) How many stages are required at total reflux?

e) What is (L /V)min? What is (L /D)min?

Answer #1

Separation of Acetone and Ethanol
A distillation column with a total condenser and partial
reboiler is separating acetone and ethanol (equilibrium data is
provided in the table below). The feed is 70 mole% acetone, flows
at 1000 mol/h, and is a superheated vapor for which one mole of
liquid must be vaporized on the feed plate to cool four moles of
feed. We desire a bottoms composition of 5 mole% acetone and a
distillate composition of 90 mole% acetone. The...

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