Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 4: Stoichiometry

Oxidation of Naphthalene to Phtahalic Anhydride

We are going to rework the class problem for the case of 3.5% naphthalene and 96.7% air and for a pressure of 10 atm and a temperature of 500K. A feed under these conditions naphthalene is the limiting reactant.

  1. Stoichiomentric Table - Batch System

    Species Symbol In Change Out
    Naphthalene A NA0 -NA0X NA = NA0(1-X)
    Oxygen B NB0 = NA0 -9/2NA0X NB = NA0( - 9/2X)
    Phthalic Anhydride C NC = 0 +NA0X NC = NA0X
    Carbon Dioxide D ND = 0 +2NA0X ND = 2NA0X
    Water E NE = 0 +2NA0X NE = 2NA0X
    Nitrogen I NI = NA0 --- NI = NA0
    Total   NT0   NT = NT0 + NA0X
            = [1 + 2 + 2 - 9/2 - 1] = -1/2
    Stoichiometric Table - Flow System
    Species Symbol In Change Out
    Naphthalene A FA0 -FA0X FA = FA0(1-X)
    Oxygen B FB0 = FA0 -9/2FA0X FB = FA0( - 9/2X)
    Phthalic Anhydride C FC = 0 +FA0X FC = FA0X
    Carbon Dioxide D FD = 0 +2FA0X FD = 2FA0X
    Water E FE = 0 +2FA0X FE = 2FA0X
    Nitrogen I FI = FA0 --- FI = FA0
    Total   FT0   FT = FT0 + FA0X





  3. Determine each of the following solely as a function of the conversion of naphthalene, X for a constant-pressureisothermal flow reactor.
    1. Find the concentration of O2
      Gas Phase Flow System:



      Constant pressure and isothermal: P = Po; T = To



    2. Find the volumentric flowrate


      Constant pressure and isothermal: P = Po; T = To



    3. Find the reaction rate
      Rate Law:     -rA = kAC2ACB

For a constant volume isothermal batch reactor,
  1. The concentration of O2
    For Batch: V = V0, CB = NB/V = NB/V0

  2. The total pressure, P.

  3. The rate law
    Rate Law:     -rA = kAC2ACB

Back to Chapter 4