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 with same flow rate
Processes three reactants at different flow rates

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Many body collisions are not favoured energetically
Of requirement of very large concentration for such reactions
Of low probability of many body collisions
Of very large activation energy of many bodies

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