Discussion
Assertion (A): A recycle reactor spans the range between plug flow and stirred tank behaviour.
Reason (R): At zero recycle it is a plug flow reactor and at infinite recycle a stirred tank.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the two limits. With no recycle the fluid makes a single pass and the vessel is a PFR. With very large recycle the feed is diluted into a stream circulating many times, so the composition becomes almost uniform and the vessel behaves as a stirred tank. Varying the ratio therefore sweeps the whole range between the two ideals, which makes the recycle reactor useful for measuring kinetics.
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