Discussion
Adding a reactant gradually to a semi-batch reactor can improve selectivity when
Answer: A
Correct answer: low concentration favours the wanted reaction
Feeding a reactant slowly keeps its concentration low throughout, since it is consumed almost as fast as it arrives. That is the semi-batch reactor’s purpose: it delivers the low-concentration condition a stirred tank gives, while retaining batch operation and the control of a slow addition. It helps only when low concentration is what selectivity wants - where the unwanted reaction has the higher order.
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