6 8 absorption of acetone from air ninety five percent of the acetone
6.8. Absorption of acetone from air.
Ninety-five percent of the acetone vapor in an 85 vol air stream
is to be absorbed by countercurrent contact with pure water in a
valve-tray column with an expected overall tray efficiency of 50%.
The column will operate at 20°C and 101 kPa. Equilibrium data for
acetone-water at these conditions are as follows:
Acetone in water, mol
7.20 11.7 17.1
Acetone partial pressure in air, torr 30.00 62.80 85.4 103.0
Calculate (a) the minimum value of L'/V", the ratio mol H₂O/mol air:
(b) the total number of equilibrium stages using a value of
L'/V' of 1.25 times the minimum; and (c) the concentration of
acetone in the exit water.
From Table 5.3 for N connected equilibrium stages, there are 2N+
2C+5 degrees of freedom. The following values are specified in this
Stage pressures (101 kPa)
Stage temperatures (20°C)
Feed stream composition
Water stream composition
Feed stream, T. P
Water stream, T. P
|xx J Juma
One more specification is needed. Take the gas feed rate at
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