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

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

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

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

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