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Three of the following are advantages of a fluidised bed. Which is the odd one out?

  • A.continuous catalyst circulation
  • B.good heat transfer to internal surfaces
  • C.a flow pattern close to plug flow
  • D.very uniform temperature

Answer: C

Gas bubbling through the bed gives poor contacting rather than plug flow. The other three are the genuine advantages that justify the arrangement. Contacting is where it loses out. Bubbles carry gas past the solid unreacted.

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