Chemical Reaction Engineering
Batch process is preferred over continuous process, when the

Product yields and quality can not be achieved in continuous process, because of long residence time
Same equipment can not be used for several processes of the same nature
All of these
Sales demand of product is not steady

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

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