Chemical Reaction Engineering
A batch reactor is

Most suitable for very large production rate
Least expensive to operate for a given rate
Suitable for gas-phase reactions on commercial scale
Suitable for liquid phase reactions involving small production rate

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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)
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
A highly exothermic reaction is to be controlled

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