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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

Calculate:

(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.

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

Calculate:

(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.

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