1. Chemical Reaction Engineering Asynchronous Video Series Chapter 6, Part 1: Series, Parallel and Complex Liquid Phase Reactions: Selectivity, Mole Balances and A-->B-->C in a Batch Reactor H. Scott Fogler, Ph.D.

2. Multiple Reactions Use molar flow rates and concentrations; DO NOT use conversion! Types of Multiple Reactions 1.Series Reactions 2.Parallel Reactions

3. Multiple Reactions Use molar flow rates and concentrations; DO NOT use conversion! Types of Multiple Reactions 1.Series Reactions 2.Parallel Reactions 3.Complex Reactions: Series and Parallel 4.Independent

4. Selectivity and Yield InstantaneousOverall Selectivity

5. Selectivity and Yield InstantaneousOverall Selectivity Yield:

6. Selectivity and Yield InstantaneousOverall Selectivity Yield: Example:(1)desired product, r D =k 1 C A 2 C B (2)undesired product, r U =k 2 C A C B

7. Selectivity and Yield InstantaneousOverall Selectivity Yield: Example:(1)desired product, r D =k 1 C A 2 C B (2)undesired product, r U =k 2 C A C B Run at high concentration of A. Therefore, use a PFR.

8. Selectivity and Yield (1)desired product, r D =k 1 C A 2 C B (2)undesired product, r U =k 2 C A C B Add a third reaction. (3)

9. Selectivity and Yield (1)desired product, r D =k 1 C A 2 C B (2)undesired product, r U =k 2 C A C B Add a third reaction. (3) then CACA S D/U1/U2

10. Modification of the Algorithm for Multiple Reactions

15. Mole Balances

20. Net Rate of Reaction for Species A

22. Series Reactions

24. , t=0 C A =C A0

25. Series Reactions