10.37 first midterm
March 23, 2007
3 problems total
Problem 1. (40 points total)
The following liquidphase hydration reaction occurs in a 10,000 L CSTR:
A
+
H
2
O
⎯
→
⎯ ⎯
B
With a firstorder rate constant of 2.5 x 10
3
min
1
.
a)
(20 points) What is the steadystate fractional conversion of A if the feed rate is
0.3 L/sec and the feed concentration
C
A,o
= 0.12 mol/L?
b)
(10 points) If the feed rate suddenly drops to 70% of its original value and is
maintained there, what is the fractional conversion of A after 60 minutes, and
what is the new steady state fractional conversion?
c)
(10 points) What is the ratio of the steadystate productivity (moles/time) of B for
case b) relative to case a)?
Problem 2. (30 points)
A 600 L tank reactor gives 75% conversion for a first order irreversible reaction.
However, the paddle turbine motor is underpowered and so the tank is not well stirred.
In
fact, a pulsetracer experiment to determine the residence time indicates that
approximately 400 L of the tank may be considered as a dead volume that does not
interact appreciably with the input or output streams.
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 Fall '04
 ClarkColton
 pH, Reaction, Rate equation, Biological Reaction Engineering, 10.37 Chemical and Biological Reaction Engineering, K. Dane Wittrup

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