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An equilibrium stage tower running at ambient conditions is to be used to remove SO2 from an air mixture by absorption with pure water The flow rate of the inlet gas mixture is 138 lbmolmin The

  1. An equilibrium stage tower running at ambient conditions is to be used to remove SO2 from an air mixture by absorption with pure water. The flow rate of the inlet gas mixture is 1.38 lbmol/min. The inlet mole fraction of SO2 is 5.5x10-4 and 90 % removal is required. The equilibrium relationship is ye = 33xs.
    1. Calculate the minimum flow rate of pure water in gal/min.
    2. Determine the number of ideal stages that are needed if the water flow rate is 1.5 times the minimum by using the Kremser equation and the McCabe-Thiele graphical method.
  1. Perform a mole balance around a differential volume S·?z where gas is being absorbed to derive the following equation for the height of a packed column,

 

  1. If the operating and equilibrium lines are both straight and parallel, prove that
  1. Calculate NOy if the inlet gas mixture has 0.001 mole fraction and 90% removal is desired.
  2. If the equilibrium relationship is ye=3xe, use the McCabe-Thiele method to estimate the number of ideal stages that would be required for this separation. Hint: as shown in Figure 18.13, the number of theoretical plates should equal the number of transfer units.

Jul 23 2020 View more View Less

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