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State whether the following is true or false.
Selectivity considerations can outweigh conversion in choosing a reactor.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

Correct answer: True

Where a wanted product is worth much more than the reactant, and the unconverted reactant can be separated and recycled, a reactor running at modest conversion with excellent selectivity is worth far more than one running to completion with poor selectivity. Selectivity losses are permanent - the material has become something else - while unconverted reactant is only a separation cost.

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