Chemical Reaction Engineering
A trickle bed reactor is the one, which

Employs all the three phases (i.e.. .solid, liquid and gas)
Has altogether three streams either entering or leaving
Processes three reactants at different flow rates
Processes three reactants with same flow rate

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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
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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