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MSC,MBA(IT)
Standford
Jun-1997 - Sep-2000
IT Manager
Honeywell
Aug-2001 - Present
A saturated liquid solution of 40 mol% acetone and 60 mol% acetic acid is fed at a rate of 100 lb mol/hr to a distillation column. The desired separation of acetone is a 96 mol% distillate concentration and a 5 mol% bottoms concentration. The column is operated at 1.6 times the minimum reflux ratio, so R D ¼ 0.44. The average column
temperature is 95 °C and the average liquid density is 0.95 g/cm 3 . The liquid depth on
a tray is 1.5 cm, and the tower diameter is 30 cm. The mass transfer coefficients are k G a
¼ 505 sec -1 and k L a ¼ 1.8 sec –1 . Equilibrium data for acetone and acetic acid are
|
x (acetone) |
y (acetone) |
|
0.0 |
0.0 |
|
0.05 |
0.162 |
|
0.10 |
0.306 |
|
0.20 |
0.557 |
|
0.30 |
0.725 |
|
0.40 |
0.840 |
|
0.50 |
0.912 |
|
0.60 |
0.947 |
|
0.70 |
0.969 |
|
0.80 |
0.984 |
|
0.90 |
0.993 |
|
1.00 |
1.000 |
Determine the Murphree efficiency from Eq. 13.4-7, and then find the number of stages and the feed tray location for this column. (D. McCullum).
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