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

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

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

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

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