Chemical Reaction Engineering
Mean residence time is equal to the space time, when

All of these
There is no change in number of moles in gaseous reaction
The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
The feed rate is measured at temperature and pressure in the reactor

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

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