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Industrial and Laboratory Reactors 225
Figure 4-4. A semi-batch reactor with outside circulation.
circumstances, reactions are sometimes performed under semi-batch
conditions. This means that one or more reagents that do not react are
completely entered in a vessel and the final reagent is then added
under controlled conditions. No product is withdrawn until the entire
reagent has been added and the reaction has proceeded to the required
extent. As an example, consider the reaction A + B → C , where
k 1
the reactor is first charged with reagent A and later reagent B is added
continuously until the reaction is complete. Examples of this reaction
process are:
