Ninety-five percent of the acetone vapor in an 85 vol%

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 essentially at 20°C and 101 kPa pressure. Equilibrium data for acetone-water at these conditions are:
Mole percent acetone in water 3.30 7.20 11.7 17.1
Acetone partial pressure in air, torr 30.00 62.80 85.4 103.0
(a) The minimum value of L'/ V', the ratio of moles of water per mole of air.
(b) The number of equilibrium stages required using a value of L'/ V' of 1.25 times the minimum.
(c) The concentration of acetone in the exit water. From Table 5.2 for N connected equilibrium stages, there are 2N + 2C + 5 degrees of freedom. Specified in this problem are

The remaining specification is the feed flow rate, which can be taken on a basis of 100kmol/h.

Stage pressures (101 kPa) Stage temperatures (20 C) Feed stream composition Water stream composition Feed stream 7. P C-


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