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1.
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(30%) The irreversible decomposition of A is
catalyzed by B . The time of half completion of the batch reaction
was determined for various initial compositions. From the results estimate:
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The order of reaction with respect to A ; |
| (ii) |
The order of reaction with respect to B ; |
| (iii) |
The rate constant at this temperature. |
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(a)
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It is proposed to decompose A in solution, using B
as catalyst at a concentration of 0.002 g mole/l, in a constant
volume, well stirred reactor of 10000 liter. What flow rate of solution
can be treated if the product is not to contain more than 5% of
the original A? |
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(b)
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If the reactor is started by rapidly filling it with reagent
solution and thereafter using this flow rate, how long will it be
before the concentration of A in the product is 6% of that
in the feed? |
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2.
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(20%) Under steady state operation for the first
order reaction, A → B, a CSTR reactor volume of 2V
m3 is divided into two equal parts with backflow pvo
, and a volumetric flow rate of vo m3/min,
as shown in the right figure, determine the exit concentration of
A . How about the situation is, when the value of p
approaches 0 and 
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3.
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(25%) The gas phase, solid-catalyzed reaction, A →
B + C occurred at 200 °C in a differential reactor with the
following rate data. |
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(a)
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Suggest a rate law consistent with the experimental data. |
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(b)
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From your rate expression, suggest an 'Adsorption-Reaction-Desorption'
mechanism and rate-limiting step for this reaction. |
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4.
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(15%) The thermal decomposition of ethane is believed to follow the
sequence below: |
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| initiation |
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| initiation |
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| propagation |
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| propagation |
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| terminaion |
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(a)
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Derive the rate expression for the formation of hydrogen. |
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(b)
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What are the major products? What are the minor products? |
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5.
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(10%) A pulse of concentrated NaCl solution is introduced
as tracer into the fluid entering a vessel (V =10 liter,
 = 10 liter/min)
and the concentration of tracer is measured in the fluid leaving
the vessel. Develop a flow model to represent the vessel from the
tracer output data sketched in the right figure. |
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