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The breakthrough point of an adsorption bed is reached when

  • A.The bed is completely saturated
  • B.The pressure drop doubles
  • C.Regeneration begins
  • D.The outlet concentration begins to rise

Answer: D

The mass transfer zone travels through the bed and eventually reaches the outlet, at which point the effluent concentration climbs. Beds are switched at breakthrough rather than at saturation, since the last part of the capacity is bought at the price of emission.

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