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A packed tower is generally preferred to a plate tower for absorption when

  • A.The gas flow is very large and variable
  • B.Frequent cleaning is required
  • C.Solids are present in the gas
  • D.The liquid is corrosive or foaming

Answer: D

Packing gives a large interfacial area with a modest pressure drop and is easily built in corrosion-resistant materials. Plate towers handle solids and large turndown better, since a packed bed fouls and channels when solids are present.

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