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Statement I: An adsorption bed is switched at saturation rather than at breakthrough.

Statement II: The mass transfer zone reaches the outlet before the bed is fully saturated.

In the light of the above statements, choose the correct answer.

  • A.Both Statement I and Statement II are correct
  • B.Both Statement I and Statement II are incorrect
  • C.Statement I is correct but Statement II is incorrect
  • D.Statement I is incorrect but Statement II is correct

Answer: D

The second is correct and it explains why beds are switched early: continuing past breakthrough buys the last of the capacity at the price of an emission. Working capacity is therefore well below the equilibrium figure.

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