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A semi-batch operation is one in which

  • A.the reaction is stopped part way through
  • B.two reactors are operated alternately
  • C.the temperature is held quite constant
  • D.material is added or removed, not both

Answer: D

Feeding one reactant slowly into a charge of another is the common industrial case, used to control a strongly exothermic reaction. The balance keeps both an inlet and a generation term. Only the outlet term is missing from the general form.

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