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Chapter 2: Conversion and Reactor Sizing
Old Exam Questions
The adiabatic exothermic irreversible gas phase reaction
is to be carried out in a flow reactor for a stoichiometric feed of A and B.
Additional Information
a) What PFR volume is necessary to achieve 50% conversion?
V1 =
V1=(500−100)(0.5)=200dm3
V1=(500−100)(0.5)+(100)(0.5)=250dm3
V1=12(500−100)(0.5)+(100)(0.5)=150dm3
b) What CSTR volume is necessary to achieve 50% conversion?
V1 =
V1=12(500)(0.5)=125dm3
V1=(500)(0.5)=250dm3
V1=(500−100)(0.5)=200dm3
c) What CSTR volume must be added to raise the conversion in Part (b) to 80%?
V2 =
V2=(100)(0.8)=80dm3
V2=(500−100)(0.8)=160dm3
V2=(100)(0.8−0.5)=30dm3
d) What PFR volume must be added to raise the conversion in Part (b) to 80%?
V2 =
V2=12(500−100)(0.8−0.5)=60dm3
V2=12(500−100)(0.8−0.5)+100(0.8−0.5)=90dm3
V2=(500−100)(0.8−0.5)+100(0.8−0.5)=150dm3
Solution
a) What PFR volume is necessary to achieve 50% conversion? V1 = 150 dm3
b) What CSTR volume is necessary to achieve 50% conversion? V1 = 250 dm3
Shaded Area: 
c) What CSTR volume must be added to raise the conversion in Part (b) to 80%? V2 = 30 dm3
Shaded Area: 
d) What PFR volume must be added to raise the conversion in Part (b) to 80%? V2 = 90 dm3
Shaded Area: 