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10.32
Spring 2005
Problem Set 2
Due Wednesday, February 23, 2005
Problem 1
A distillation column is fed two feed streams containing components A and B, each at a
flow rate of 100 mol/hr.
Stream 1 is a saturated liquid containing 40 mole percent A and Stream
2 is a saturated liquid containing 60 mole per cent A.
The distillate should contain 99 mol
percent of component A and the bottom product should contain one mol percent A.
The relative
volatility of A to B is 2.5, independent of temperature.
You are asked to consider two cases:
Case 1.
The two streams are mixed together and introduced to the column at the optimal
location. After mixing, the feed to the column may be assumed to be a saturated liquid.
The
column has a partial reboiler and a total condenser.
a)
Find the minimum number of stages and the minimum reflux ratio.
b)
If the column is operated at a reflux ratio 1.2 times the minimum reflux ratio, what
number of theoretical stages are required and where should the feed be added?
Case 2.
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 Fall '04
 ClarkColton
 Distillation, Mole, pH

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