Reactions in Series Plug Flow and Perfectly Mixed Reactors

Example 12.4-3 Reactions in Series Plug Flow and Perfectly Mixed Reactors 

Consider a plug flow reactor, with mean residence time t, followed by a perfectly mixed reactor, with mean residence time, i2. The overall RTD for this system will merely be that for a perfectly mixed vessel, but with a time delay caused by the 

If the order of the two vessels is reversed, exactly the same RTD would be obtained, even though the time delay is now after rather than before the mixing. Thus, a tracer test would not differentiate between the two arrangements. 

Now a first-order reaction will give an exit concentration of 

NONIDEAL FLOW PATTERNS AND POPULATION BALANCE MODELS 

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