Intermittant addition of reactants

There are many variants on the batch-recycle mode. A practical example is shown in Fig, 19. Semi-batch operation allows for continuous or intermittent addition of reactant. 

In comparison with a batch reactor, the gradual or intermittent addition of a reactant (say, B in A + B -> products, Figure 12.3(a)) in semibatch operation can result in improved control of T, particularly for a reaction with a large... 

In Illustration 10.7 we consider how to meet the vast majority of the heat transfer requirements for operation of a semibatch reactor by a semi-autothermal mode of processing. By intermittent addition of a cold reactant stream to the hot contents of a well-stirred semibatch reactor, it is possible to maintain the system temperature within prescribed limits. 

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