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For an autocatalytic reaction the best arrangement is often

  • A.a batch reactor and nothing else
  • B.a CSTR at the rate maximum, then a PFR
  • C.a single large plug flow reactor alone
  • D.a single small stirred tank reactor

Answer: B

The CSTR carries the mixture quickly past the slow initial region where there is no product to catalyse the reaction. The PFR then finishes the job efficiently where the rate is falling. The combination beats either reactor alone.

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