Chemical Reaction Engineering
A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

0.5τ
0.693τ
τ/0.693

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Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

A highly exothermic reaction is to be controlled
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of these
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided

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