Example-
4.5) Calculation of Number of Transfer Units
Air, containing 3 %
acetone by volume is to be washed with water in
a packed column operating
counter-currently at 1 bar and 25 oC, to reduce the
acetone content to 0.5 % by volume. The flow rates of the gas and acetone-free
water to the column are
300 k-mol/h and 690
k-mol/h respectively.
a) Write the operating line equation,
b) Calculate the concentration of liquid
solution leaving the column as mass percent,
c) Calculate the percentage recovery of
acetone,
d) Calculate number of the over-all gas
transfer units required.
At the operating
pressure, temperature and the concentration range the equilibrium distribution
of acetone between air and water is given as y*=2.2x, where y and x are the
mole fraction of acetone in gas and liquid respectively.
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