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Chemical Reaction Engineering

Chemical Reaction Engineering. Chapter 4, Part 3: Pressure Drop in a Packed Bed Reactor. Algorithm for Isothermal Reactor Design. Mole Balance and Design Equation Rate Law Stoichiometry Combine Evaluate. Algorithm. Analyze the following second order gas phase reaction that occurs

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Chemical Reaction Engineering

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Presentation Transcript

  1. Chemical Reaction Engineering Chapter 4, Part 3: Pressure Drop in a Packed Bed Reactor

  2. Algorithm for Isothermal Reactor Design • Mole Balance and Design Equation • Rate Law • Stoichiometry • Combine • Evaluate

  3. Algorithm Analyze the following second order gas phase reaction that occurs isothermally in a PBR: 

  4. Algorithm Analyze the following second order gas phase reaction that occurs isothermally in a PBR:  Mole Balance: Must use the differential form of the mole balance to separate variables:

  5. Algorithm Analyze the following second order gas phase reaction that occurs isothermally in a PBR:  Mole Balance: Must use the differential form of the mole balance to separate variables: Rate Law: Second order in A and irreversible:

  6. Algorithm Analyze the following second order gas phase reaction that occurs isothermally in a PBR:  Mole Balance: Must use the differential form of the mole balance to separate variables: Rate Law: Second order in A and irreversible: Stoichiometry: with T=T0

  7. Algorithm Analyze the following second order gas phase reaction that occurs isothermally in a PBR:  Mole Balance: Must use the differential form of the mole balance to separate variables: Rate Law: Second order in A and irreversible: Stoichiometry: with T=T0 Combine: Need to find (P/P0) as a function of W (or V if you have a PFR).

  8. Pressure Drop in Packed Bed Reactors

  9. Pressure Drop in Packed Bed Reactors Ergun Equation:

  10. Pressure Drop in Packed Bed Reactors Ergun Equation:

  11. Pressure Drop in Packed Bed Reactors Ergun Equation:

  12. Pressure Drop in Packed Bed Reactors Ergun Equation: Let

  13. Pressure Drop in Packed Bed Reactors Ergun Equation: Let Catalyst Weight: Let and

  14. Multiple Reactions and Pressure Drop

  15. Multiple Reactions and Pressure Drop In terms of conversion:

  16. Multiple Reactions and Pressure Drop In terms of conversion:

  17. Multiple Reactions and Pressure Drop In terms of conversion:

  18. Analytical Solution

  19. Analytical Solution

  20. Separate Integrate Analytical Solution

  21. Separate Integrate Analytical Solution For gas phase reactions, as the pressure drop increases, the concentation decreases, resulting in a decreased rate of reaction, hence a lower conversion when compared to a reactor without a pressure drop.

  22. What if… Dpand Ac change? } } Turbulent Laminar

  23. What if… Dpand Ac change? } } Turbulent Laminar

  24. What if… Dpand Ac change? } } Turbulent Laminar

  25. What if… Dpand Ac change? } } Turbulent Laminar

  26. Polymath Solution

  27. Polymath Solution

  28. Polymath Solution

  29. Polymath Solution

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