Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

All of these
Plug flow for dilute liquid requiring no large preheating of feed
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
High recycle for pure gas

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Chemical Reaction Engineering
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b

Avoid recycle, when a > b
Use batch reactor or plug flow reactor, when a > b
Use CSTR with a high conversion, when a > b
Use high pressure and eliminate inerts, when a > b

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