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

Chapter 6 Self Test

What four things are wrong with this membrane reactor solution?

The gas phase elementary reaction

2A → B + 2C

is carried out in a membrane reactor in which there is pressure drop with α = 0.019 kg-1. An equal molar feed of A and inerts, I, enter the reactor and only species B can exit the membrane. Plot the conversion of A down the membrane reactor containing 50 kg of catalyst. The specific reaction rate is kA = 2.5 dm6/mol/kg/s, and the mass transfer coefficient kC = 1.5 dm3/kg•s

Proposed Solution

Identify 4 things that are incorrect

  1. ________________________  should be  ________________________

  2. ________________________  should be  ________________________

  3. ________________________  should be  ________________________

  4. ________________________  should be  ________________________

Go to Actual Solution

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First Incorrect Thing

rB = -kCA  should be  rA = -kCA2

Back to Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Second Incorrect Thing

rA = -rB/2  should be  rB = -rA/2

Back to Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Third Incorrect Thing

FT = FA + FB + FC  should be  FT = FA + FB + FC + FI

Back to Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fourth Incorrect Thing

y = (1 - αW)1/2  should be 

Back to Problem

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Actual Solution

rB = -kCA  should be  rA = -kCA2

rA = -rB/2  should be  rB = -rA/2

FT = FA + FB + FC  should be  FT = FA + FB + FC + FI

y = (1 - αW)1/2  should be 

FT0 = FA0 + FI

FI = FA0


Back to Chapter 6