Topic outline

  • General

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    • Levenspiel 3rd Edition - Problems Checklist
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  • Multiple Reactions

    • Mole Balance in Multiple Reactions Page
      1993-13-b-cre
      For multiple reactions \[ \begin {align*} 2A &\rightarrow R \\
      2R &\rightarrow S \end {align*} \]       the number of moles of \(S\) present when the number of moles of \(A\) and \(R\) are 0.3 and 0.5 respectively (Initially 2 moles of \(A\) are only present) are ________ (0.125 / 0.175 / 0.350 / 0.535)
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    • Selectivity of Parallel Reactions Page
      2000-1-20-cre
      For the liquid phase parallel reactions \[ \begin {align*} A &\rightarrow R& r_R &= k_1C_A^2;& E_1 &= 80 \text { kJ/mol}  \\
      A &\rightarrow S& r_S &= k_2C_A;& E_2 &= 120 \text { kJ/mol} \end {align*} \]       the desired product is \(R\). A higher selectivity of \(R\) will be achieved if the reaction is conducted at
      1. low temperature in a CSTR
      2. high temperature in a CSTR
      3. low temperature in a PFR
      4. high temperature in a PFR
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    • Maximizing the Yield with 3 Parallel Reactions Page
      2011-22-cre
      Reactant \(R\) forms three products \(X\), \(Y\), and \(Z\) irreversibly, as shown below.

       The reaction rates are given by \(r_X=k_XC_R\), \(r_Y=k_YC_R^{1.5}\) and \(r_Z=k_ZC_R\). The activation energies for formation of \(X\), \(Y\), and \(Z\) are 40, 40 and 5 kJ/mol respectively. The pre-exponential factors for all reactions are nearly same. The desired conditions for MAXIMIZING the yield of \(X\) are
      1. high temperature, high concentration of \(R\)
      2. high temperature, low concentration of \(R\)
      3. low temperature, high concentration of \(R\)
      4. low temperature, low concentration of \(R\)
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    • Parallel Reaction in MFR Page
      Levenspiel3E-7-8
      Liquid reactant \(A\) decomposes as follows:

      A feed of aqueous \(A\) (\(C_{A0}=40\) mol/m3) enters a mixed flow reactor, decomposes, and a mixture of \(A, R\) and \(S\) leaves. Find \(C_R\) and \(C_S\) and \(\tau\) for \(X_A=0.9\).
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    • Parallel Reactions in MFRs in Series - First Order Page
      Levenspiel3E-7-6
      Substance \(A\) in a liquid reacts to produce \(R\) and \(S\) as follows:

      A feed (\(C_{A0} = 1 \text{ mol/liter}, C_{R0} = 0 \text{ mol/liter}, C_{S0} = 0 \text{ mol/liter}\)) enters two mixed flow reactors in series, with \(\tau_1=2.5 \text{ min}\) and \(\tau_2=5 \text{ min}\). Knowing the composition in the first reactor (\(C_{A1}=0.4 \text{ mol/liter}, C_{R1}=0.4 \text{ mol/liter}, C_{S1}=0.2 \text{ mol/liter}\)), find the composition leaving the second reactor.
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    • Parallel Reactions in MFRs in Series Page
      Levenspiel3E-7-7
      Substance \(A\) in the liquid phase reacts to produce \(R\) and \(S\) as by the following reactions:

      The feed (\(C_{A0} = 1 \text{ mol/liter}, C_{R0} = 0 \text{ mol/liter}, C_{S0} = 0.3 \text{ mol/liter}\)) enters two mixed flow reactors in series, with \(\tau_1=2.5 \text{ min}\) and \(\tau_2=10 \text{ min}\). Knowing the composition in the first reactor (\(C_{A1}=0.4 \text{ mol/liter}, C_{R1}=0.2 \text{ mol/liter}, C_{S1}=0.7 \text{ mol/liter}\)), find the composition leaving the second reactor.
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    • Parallel Reactions in PFR Page
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      Levenspiel3E-7-9
      Liquid reactant \(A\) decomposes as follows:

      A feed of aqueous \(A\) (\(C_{A0}=40\) mol/m3) enters a plug flow reactor, decomposes, and a mixture of \(A, R\) and \(S\) leaves. Find \(C_R\) and \(C_S\) and \(\tau\) for \(X_A=0.9\).
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    • Conditions Maximizing a Parallel Reaction in MFR Page
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    • Parallel Bimolecular Reactions in MFR Page
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    • Maximizing the Desired Product - 3 Parallel Reactions in MFR Page
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    • Maximizing the Yield with Series Reactions Page
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    • Series Reactions in PFR and MFR Page
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    • Series Reactions in Batch Reactor - First Order followed by Zeroth Order Page
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    • Reactor for Maximizing the Desired Product from Yield Plot Page
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