Question

A packed tower (cross-sectional area: 0.093 m2) is filled with 25.4 mm ceramic rings and it is used for SO2 absorption from air by using pure water inlet. The entering gas contains 20 mol% SO2 and the leaving gas is mandated to contain 2 mol% SO2 before being discharged into the air. The air flow rate is 6.53 x 10-4 kgmol air/s while the water flow rate is 4.2 x 10-2 kgmol water/s. The volumetric film transfer coefficients are given by: k’y a = 0.0594 . Gy0.7 . Gx0.25 (kgmol/s.m3.mol fraction) k’x a = 0.152 . Gx0.82 (kgmol/s.m3.mol fraction) where Gy = kg total gas/s.m2 and Gx = kg total liquid/s.m2 Using the equilibrium data in table A.3-19, calculate the tower height by using K’y a. For numerical integrations, please use 2 points at the y values of 0.08 and 0.15, in addition to the ends of the columns. Please calculate the K’y a values using the approach outlined in Example 10.6.2(c) in your notes (no other approach will be accepted).

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Answer 1

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