How to solve question 5 in the afternoon session of the 2011 case study
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5. In a packed tower operated in countercurrent mode, a pure solvent is used to absorb the harmful components in a gas mixture. The equilibrium relationship is known to be Y=2X, the liquid-to-gas ratio in the operation is L/V=2, the concentration of the gas phase entering the tower is 0.008 (mole fraction), and the concentration of the liquid phase leaving the tower is 0.0035 (mole fraction). If a plate column is used, what will be the required number of theoretical plates? (A) 6 (B) 5 (C) 8 (D) 7
When A=1, if you plot the graph, you will find that the equilibrium line and the operating line are parallel; the mass transfer driving forces are identical, so there is no need to use the logarithmic average for calculations. In this case, it is sufficient to divide (Y1-Y2) by the driving force