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This quiz contains multiple-choice problems on batch reactor design equations, flow reactors design equations, ideal reactors problems, flow reactors, right reactor series, space-time and velocity.
Find the volume of reactor needed for 70% conversion of A to the product. An aqueous feed of A and B (200L/min, 20mmolA/L, 50mmolB/L) is fed to MFR. Reaction kinetics is as follows:
A + B → P
-rA = 200CACB mol/L-min
12.5
3.6
6.4
1.5
For a constant volume system, the size of the batch reactor is __ PFR.
Smaller than
Larger than
Same as
Cannot be compared
How should two unequal-sized MFRs be connected in series to maximize production for a first-order homogenous reaction?
Smaller MFR followed by larger MFR
Larger MFR followed by smaller MFR
Any arrangement
MFR’s should not be connected in series
For all positive reaction orders and any particular duty, the MFR is always larger than the PFR. True or false?
True
False
A graphical procedure for finding conversion in MFRs of different sizes in series is called __ method.
Newton’s
Wheeler’s
Octave’s
Jones’s
The best arrangement of reactors for a reaction whose rate-concentration curve rises monotonically is
Plug, large MFR, small MFR
Plug, small MFR, large MFR
Large MFR, small MFR, plug
Small MFR, plug, large MFR
Four MFRs operate in series with the total space time being 5 minutes. If a single PFR replaces it, what will be the space time? First-order reaction with rate constant 2 min^(-1), concentration reduces from 50 mol/m^3 to 10 mol/m^3.
0.805
0.123
0. 562
0.439
Space time is defined as
The time required to process unit volume of feed
The time required for the reaction to occur
The time required to produce unit volume of product
The time to process the entire volume of feed entering
Space velocity is the number of unit volumes of feed that can be treated per unit time. True or false?
True
False
An existing MFR must be replaced by one four times larger than it. Find the new conversion if a homogeneous liquid phase reaction with reaction kinetics as follows:
A → R
-rA = kCA2 with 30% conversion
0.67
0.45
0.53
0.92
Replace the existing MFR with a PFR and calculate the new conversion of a homogeneous liquid phase reaction with reaction kinetics as follows:
A → R
-r{A} = kC*A{2} with 30% conversion
0.65
0.43
0.38
0.92
How should a PFR and MFR be connected to maximize production from a first-order reaction?
MFR followed by PFR
PFR followed by MFR
Any arrangement
MFR and PFR should not be connected
The effect of flow type on reactor performance when the conversion is small
Is none
Cannot be determined
Is very small
Is very large
The unit of space velocity is
s
s^(-1)
m^3
m^(-3)
Find the conversion of a 25 L PFR if a gaseous feed of pure A (2 mol/L, 150 mol/min) Is decomposed (kinetics are as follows: A → 2.5R; - r{A} = (15min^(-1))*C{A})
0.89
0.92
0.45
0.68
