A gas stream of flow rate 10.0 lbmole/ft 2 · h contains 6.0% sulfur dioxide (SO 2

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A gas stream of flow rate 10.0 lbmole/ft2· h contains 6.0% sulfur dioxide (SO2) by volume in air. It is desired to reduce the SO2level in the treated gas to no greater than 0.5% in a counter current packed tower operating at 30°C and 1.0 atm total system pressure, using water containing no dissolved SO2as the absorption solvent. The desired solvent flow rate is 2.0 times the minimum solvent flow rate. At these flow conditions, the film mass-transfer coefficients and kxα = 250 lbmole/ft3· h, and kyα = 15 lbmole/ft3· h, for the liquid and gas films, respectively. Equilibrium distribution data for SO2in water at 30°C is provided in the table below.PA (mm Hg) 143 0.96 3.0 9.1 43.1 59.7 106 0.729 mole H2S/mole MEA 0.125 0.208 0.362 0.642 0.814 0.842


a. Specify the molar flow rate and mole fraction composition of all terminal process streams for operation at 2.0 times the minimum solvent flow rate.
b. Determine the height of packing required to accomplish the separation or operation at 2.0 times the minimum solvent flow rate.

Equilibrium distribution data for SO2 in water at 30°C (A = SO2):
PA (mm Hg) 79 52 36 19.7 11.8 8.1 4.7 1.7 0.05 kg SO/100 kg H2O 1.0 0.7 0.5 0.3 0.2 0.15 0.1

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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