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-AB

The chlorination of benzene is carried out in a CSTR under the following conditions: 55°C, liquid saturated with chlorine gas at a pressure of 1 atm, and a benzene conversion of 30%. The reaction rates are given by

06eq6a.gif

   
     
   


The rate of benzene disappearance by reaction (1) is

k 1 C b lb mol/ galmiddoth

and the rate of monochlorobenzene disappearance by reaction (2) is

k 2 C m lb mol/ galmiddoth

     
   

where k 1 = 0.412 h-1, k2 = 0.055 h-1, and Cb and Cm are the concentrations of benzene and monochlorobenzene in lb mol/gal. Assume that the feed concentration of benzene (Cb0) is 0.10 lb mol/ gal and that liquid density is independent of composition. Do not assume that the formation of dichlorobenzene is negligible. What reactor volume is required to produce 10 lb mol of monochlorobenzene per hour? (O. M. Fuller, McGill University, Montreal)
(b) Compose and solve (numerical answer required) a problem dealing with the design and operation of a CSTR for the production of monochlorobenzene. Give the principal parts of the problem and include your simplifying assumptions under constraints. Your problem must use the rate data for both reactions.

[1st Ed. P9-14]