Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 2: Conversion and Reactor Sizing

Additional Homework Problems

CDP2-AB

For the irreversible gas-phase reaction:

 

the following correlation was determined from laboratory data (the initial concentration of A is 0.2 g mol/L):

 

The volumetric flow rate is 5 m3/s.

  1. Over what range of conversions are the plug-flow reactor and CSTR volumes identical?

  2. What conversion will be achieved in a CSTR that has a volume of 90 L?

  3. What plug-flow reactor volume is necessary to achieve 70% conversion?

  4. What CSTR reactor volume is required if effluent from the plug-flow reactor in part (c) is fed to a CSTR to raise the conversion to 90%?

  5. If the reaction is carried out in a constant-pressure batch reactor in which pure A is fed to the reactor, what length of time is necessary to achieve 40 % conversion?

  6. Plot the rate of reaction and conversion as a function of PFR volume.

  7. Critique the answers to this problem.

Solution