Chemical Reaction Engineering
Sometimes, batch process is preferred over continuous process, when the product

Both A & B
Neither A nor B
Sales demand is fluctuating
Quality & yield can not be achieved in continuous processes, because of long residence time

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Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

Three reactor volumes of feed can be processed every hour
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
It takes three hours to dump the entire volume of the reactor with feed
Conversion is cent per cent after three hours

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

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
All of these

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