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

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

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Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of these
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
A highly exothermic reaction is to be controlled

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