Chemical Engineering Reactor Problem. Earliness of Mixing.

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timer Asked: Nov 11th, 2015

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Problem 2. Earliness of Mixing To illustrate the importance of the earliness of mixing, consider a compartmental model of a reactor. 


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Problem 2. Earliness of Mixing To illustrate the importance of the earliness of mixing, consider a compartmental model of a reactor a) Late mixing can be modeled by reaction in a PFR followed by that in a CSTR (in series). Assume that the average residence time in both the PFR and the CSTR is t. For this composite reactor, derive an expression for conversion for a first order reaction, as well as that for a second order reaction. b) Now contrast this with a model for early mixing, where reaction first occurs in a CSTR, and then in a PFR. Once again, derive expressions for the conversion in both, first and second order reactions. c) Did you get the same conversion in both reactors for a first order reaction? Why? For a second order reaction, assume the rate coefficient k = 0.1 M-15-1 and the initial concentration of reactant is Cin = 1M. Plot Cout vs. T (T = 0 to 30 s) for both reactors. Which reactor results in a better conversion?
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