Two constant-volume stirred tanks, connected in series (see Figure a), are fed by a single stream with constant volumetric flow rate, q. The feed composition, c1 (mass/volume of a catalyst species), can vary with lime. Density is constant.

(a) Develop a dynamic model for this process that can be used to calculate the concentrations of catalyst exiting Tank 1 (c1) and Tank 2 (c2).

(b) Make a degrees of freedom analysis for your model, indicating input(s), output(s), parameters, and so on.

(c) Suppose a recycle stream is used to return sonic multiple of the inlet flow rate (rq) from the exit scream of the second tank back to the first stirred tank (see figure)? Repeat parts (a) and (b).

(d) For r ? ?, what can you say about the model for this process? Does it simplify in some way?

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