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Chapter 6: Isothermal Reactor Design: Molar Flow Rates
Additional Homework Problems
CDP6-DB
(Batch bromination of p-chlorophenyl isopropyl ether) You
are in charge of the production of specialty chemicals for your organization and
an order comes in for 3 lb of brominated p-chlorophenyl isopropyl ether. You
decide to use the technique reported by Bradfield et al. [J. Chem. Soc., 1389
(1949)], who carried out the reaction in 75% acetic acid at 68°F. You have a
batch reactor that holds 5 gal (0.670 ft 3
) of a reacting mixture that can be used. Starting out with a mixture that
contains 0.002 lb mol (0.34 lb) of p-chlorophenyl isopropyl ether and 0.0018
lb mol (0.288 lb) of bromine in the 5 gal, you decide to run 10 batches of the mixture
to 65% conversion of the p-chlorophenyl isopropyl ether. This procedure will
give the desired 3 lb. How long will each batch take?
Additional information:
Kinetics (from Bradfield et al.):
Reaction: 
where A is p-chlorophenyl isopropyl ether, B is bromine, and C is monobrominated product .
Rate Law: 
Specific reaction rates at 68°F:
k 1 = 1.98 ft 3 /lb
mol
min
k2 = 9.2 x 10 3 (ft 3
/lb mol) 2 min -1
[2nd Ed. P4-29]