Chemical Reaction Engineering Asynchronous Video Series

1. Chemical Reaction EngineeringAsynchronous Video Series Chapter 4, Part 3: Pressure Drop in a Packed Bed Reactor H. Scott Fogler, Ph.D.

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