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In a percolation extractor the solvent

  • A.Completely submerges the flakes in a stirred vessel
  • B.Is sprayed as a fine mist into a cyclone
  • C.Passes through the seed in vapour form
  • D.Trickles down through a bed of flakes

Answer: D

Countercurrent stages bring the freshest solvent into contact with the most nearly exhausted flakes, which maximises the driving force at every point. Immersion extractors instead submerge the material completely and suit finer particles.

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