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All of the following raise conversion for a fixed total volume EXCEPT

  • A.replacing a CSTR with a PFR of the same volume
  • B.adding interstage cooling for an exothermic reversible reaction
  • C.splitting a PFR into two PFRs in parallel
  • D.dividing a CSTR into several tanks in series

Answer: C

Two parallel plug flow reactors behave exactly as one of the combined volume, so nothing is gained. The other three all genuinely improve the conversion for the same total volume. Parallel plug flow gains nothing at all.

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