Ninety-five (95%) of acetone is to be removed from a gas air stream entering at 100 kmol/hr containing 85 mol% of air and 15 mol% of acetone by countercurrent contact with pure water in a sieve-tray column with expected overall tray efficiency if 50% (EO = 0.5). The tray hole diameter is 4.5 mm on an equilateral triangle of 12 mm pitch. The column will operate at 293 K and 101 kPa. Equilibrium data for acetone-water at these conditions are:

mol % of acetone in water 0 3.30 7.20 11.7 17.1 Acetone partial P in air, torr 0 30.00 62.80 85.40 103.0

Determine the following (for full credit, draw a well labeled diagram, state assumptions, and properly label axis in graphs):

a. b.

c. d. e.

f. g.

Given: Mair = 29 Macetone = swater = 70 dyne/cm rwater = 1 g/cm3 = 1000 kg/m3 Foaming factor = 1 Flooding factor = 0.7 Tray spacing = 0.5 1 kPa = 7.5 torr R = 8.134 kPa m3/kmol-K

0.18 0.20 o 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 Design equations for sieve tray tower: 70.5 4Q6 D= [fvgF(1-A,/A) T (0.1 X