Chemical Reaction Engineering

Asynchronous Video Series

Chapter 6, Part 3:

PFR and SemiBatch Liquid Phase

And PFR Gas Phase Reactions

H. Scott Fogler, Ph.D.

Elementary Multiple Reactions

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1( ) A + 2B→ C

2( ) 3C + 2A → D

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−r1A = k1A CA CB2

−r2C = k2CCA2 CC

3

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rA = r1A +r2 A

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rA = −k1 ACACB2 − 2

3k 2CCA

2 CC3

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r1A = −k1A CA CB2

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r2A

−2 =r2C

−3

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r2A = 23

r2 C = −23

k 2CCA2 CC

3

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rD = 0 + r2D = −r2C

3

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rD = 13

k2CCC3 CA

2

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rB = r1B + 0 = 2r1A

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rB = −2k1ACACB2

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r1B

−2=

r1A

−1r1B = 2r1A

r2B = 0

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rC = r1C +r2C = −r1A +r2C

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rC = k1ACACB2 −k2 CCA

2 CC3

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r1A

−1=

r1C

1r1C = −r1A

r2C = −k 2 CC A2 CC

3

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r1D = 0r2C

−3=

r2 D

1

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Example: Liquid Phase Reaction

Case 3: Semibatch Liquid Phase

D2A3C

C2BA

→+→+

Case 3: Semibatch Liquid Phase

D2A3C

C2BA

→+→+

Case 3: Semibatch Liquid Phase

D2A3C

C2BA

→+→+

Multiple Reactions — Gas Phase

Use Molar Flow Rates!!!

Multiple Reactions — Gas Phase

Use Molar Flow Rates!!!

The Algorithm

The Algorithm

The Algorithm

(given)

The Algorithm

(given)

The Algorithm

(given)

The Algorithm

The Algorithm

The Algorithm

The Algorithm