Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 6: Isothermal Reactor Design: Molar Flow Rates

Additional Homework Problems

CDP6-SB

     
 

The liquid-phase reaction IMAGE 04eq19.gif is carried out in a semibatch reactor. The reactor volume is 1.2 m 3 . The reactor initially contains 5 mol of B at a concentration of 0.015 kmol/m 3 . A at an aqueous concentration of 0.03 kmol/m 3 is fed to the reactor at a rate of 4 dm 3 /min. The reaction is first order in A and half order in B with a specific reaction rate of k = 6 (m 3 /kmol) 1/2 / min. The activation energy is 35 kJ /mol. The feed rate to the reactor is discontinued when the reactor contains 0.53 m 3 of fluid.

(a) Plot the conversion, volume, and concentration as a function of time. Calculate the time necessary to achieve:
(b) 97% conversion of A.
(c) 59% conversion of B.
(d) The reaction temperature is to be increased from 25°C to 70°C and the reaction is to be carried out isothermally. At this temperature the reaction is reversible with an equilibrium constant of 10 (m 3 /kmol) 1/2 . Plot the conversion of A and B and the equilibrium conversion of A as a function of time.
(e) Repeat part (d) for the case when reactive distillation is occurring. Study the effect of the evaporation rate on conversion.

[2nd Ed. P4-27]