Discussion
Arrange the following in order of decreasing conversion for the same volume, with normal kinetics.
1. two CSTRs in series
2. a plug flow reactor
3. a single CSTR
4. several CSTRs in series
Answer: A
Correct answer: 2 - 4 - 1 - 3
A single CSTR is worst, because all of it sits at the exit composition. Splitting the same volume into two tanks in series lets the first operate at a higher concentration and so a higher rate, and more tanks improve it further. In the limit of infinitely many tanks the series approaches plug flow exactly, which is why the PFR heads the order and the sequence runs downward as the number of stages falls.
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