Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 12: Steady-State Nonisothermal Reactor Design: Flow Reactors with Heat Exchange

Additional Homework Problems

CD12GA1

Exothermic reversible reaction with a variable coolant temperature. The elementary reaction

A + B 2 C

is carried out in a PBR that has a heat exchanger surrounding the reactor. The feed is equal molar in A and b with FA0 = 5 mol/s. The coolant surrounding the PBR flow in the same direction as the reactants. The feed enters at a temperature of 330 K. Plot X, Xe and T as a function of catalyst weight up to W = 4500 kg, for the base case given below.

Additional Information (base case)
E = 25 kcal/mol

CPA = CPB = CPC = 20 cal/mol/K

HRX = -20 kcal/mol

CPI = 40 cal/mol/K

k = 0.004 dm6/(kg s) at 310 K

Ua/B = 0.5 cal/(kg s K)

KC = 1000 at 303 K

Ta = 320 K

= 0.002 /kg

mC = 1000 g/s

Fao = 5 mol/s

CPmc = 18 cal/g/K

CTo = 0.3 mol/dm3

I = 1

Vary the following parameters and write a paragraph describing the trends you find for each parameter variation and why they work the way they do. Use the base case for parameters not varied.

  1. FA0     1 FA0 8 mol/s

  2. I 0.5 I 4

  3. Ua/B 0.1 Ua/B 0.8 cal/(kg s K)

  4. T0     310 K T0 350 K

  5. Ta     300 K Ta 340 K

  6. mC     1 mC 1000 g/s [ T0 = 350 , Ua/B = 0.5, Ta = 320, FA0 = 5, I = 1]

  7. Determine the conversion in a 5000 kg fluidized CSTR where UA/B = 500 cal/(kg s K)

  8. If the reaction were endothermic with KC = 0.01 at 303 and HRX = +20 kcal/mol

[3rd Ed. P8-15]