Chemical Reaction Engineering Asynchronous Video Series Chapter 6, Part 1: Series, Parallel and Complex Liquid Phase Reactions: Selectivity, Mole Balances.

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Presentation transcript:

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.

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

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

Selectivity and Yield InstantaneousOverall Selectivity

Selectivity and Yield InstantaneousOverall Selectivity Yield:

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

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.

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)

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

Modification of the Algorithm for Multiple Reactions

Mole Balances

Net Rate of Reaction for Species A

Series Reactions

, t=0 C A =C A0

Series Reactions