Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 18: Models for Nonideal Reactors

Additional Homework Problems

CDP18-IB

A second-order irreversible reaction takes place in a nonideal, yet isothermal CSTR. The volume of the reactor is 1000 dm3, and the flow rate of the reactant stream is 1 dm3/s. At the temperature in the reactor, k = 0.005 dm3/mol/s. The concentration of A in the feed stream is 10 mol/dm3. the RTD is obtained from a tracer test on this reactor at the desired feed rate and reaction temperature. From the given RTD:

  1. Estimate the (1) maximum segregation and (2) minimum segregation (maximum mixedness) conversions that can be obtained from this reactor because of the different micromixing conditions that are possible.

  2. What conversions can be effected from the tanks-in-series model?

  3. What conversion can be effected by modeling this system as two CSTRs in parallel?

  4. Compare these conversions with those of a perfectly mixed CSTR and PFR of the same volume.

Following are the RTD data of the nonideal reactor:

[3rd Ed. P14-11]