Type 9 Home Problem -- PART II of the Solution
Problems that promote discussion.

You decide to reverse the order of the reactors. You believe that if the PFR precedes the CSTR, the CSTR can achieve a final conversion of greater than 70%.

Our first step is to find the conversion of the PFR (X_i) through graphical integration.

We know that the volume of our PFR is 4.5 ft³. Using Simpson's Rule [see Appendix A.4, Elements of Chemical Reaction Engineering, (3rd Ed.)], we find that our PFR can obtain a conversion of 21% (X_i=0.21).

We then use trial and error to find the point on the graph (inverse of reaction rate (1/-rA) versus conversion (X)) that provides us with the appropriate CSTR volume. We find that our CSTR can achieve a final conversion of 73%.

The final plot can be seen below:

Back to PART I of the Solution

CRE Thoughts Ten Types Homogeneous Example 9