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

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

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Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

A fixed conversion of a given batch of feed takes 5 hours
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
Cent per cent conversion can be achieved in at least 5 hours
After every 5 hours, reactor is being filled with the feed

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