Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 8: Multiple Reactions

Additional Homework Problems

CDP8-FB

You are designing a plug-flow reactor for the following gas-phase reaction:

A D              k1=15 ft3/ lb mol*s

Unfortunately, there is also a side reaction:

A U             

U is a pollutant and costs money to dispose of; D is the desired product.

(a) What size of reactor will provide an effluent stream at the maximum dollar value? D has a value of $60/lb mol; it costs $15 per lb mol to dispose of U. A has a value of $10 per lb mol. (Ans.: V = 896 )
(b) Suppose that and . What temperature (400 to 700) would you recommend for a 400- CSTR?

Additional information:

Feed: 22.5 SCF/s of pure A
Reaction conditions: 460, 3 atm pressure
Volumetric flow rate: 15 /s at reaction donditions
Concentration of A in feed: 4.47 X mol/