This set of Fluidization Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Synthesis Reactions – 1”.
1. What is the main reason for using solid catalyst gas phase reactions in fluidized bed?
a) Temperature control
b) Increase desired product to side product
c) Reduction in hotspots of catalyst
d) All of the mentioned
View Answer
Explanation: They are therefore useful for temperature control and other reasons.
2. Which kind of flow is preferred in the fluidized reactor for production of ethylene oxide?
a) Plug flow
b) Batch reactor
c) Mixed flow
d) Cross flow
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Explanation: Because this allow maximum yield of the reaction intermediate.
3. Why is the boiling downtherm used to surround the long narrow tubes, in the fluidized bed for production of ethylene oxide?
a) Give good temperature control
b) Help in temperature fluctuations
c) Fasten the reaction process
d) None of the mentioned
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Explanation: Because it acts as a coolant which helps in temperature control.
4. What happens if we use a heater for eg. steam instead of a downtherm, in the fluidized bed for production of ethylene oxide?
a) Reactor may explode
b) Helps in better temperature control
c) Nothing will happen
d) Reaction might change
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Explanation: Since the reaction is already highly exothermic, addition of heat will worsen the situation.
5. What happens if there is no narrow tubes in the fluidized bed for the production of ethylene oxide?
a) Leads to less intermediate yield
b) Leads to maximum yield of reaction intermediate
c) No effect on the reaction
d) None of the mentioned
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Explanation: Since the reaction is exothermic, it need to be controlled which is only possible in plug flow with the help of downtherm.
6. In the HCl oxidation process, a slurry of catalyst fines in aqueous HCl is injected into the bed as?
a) Feed
b) Coolant
c) For temperature control
d) All of the mentioned
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Explanation: Slurry is therefore used as feed, as coolant and for proper temperature control.
7. What will happen if the concentration of naphthaquinone builds up in the fluidized bed for phthalic anhydride production?
a) Reaction will explode
b) Helps in temperature control
c) Acts as coolant
d) None of the mentioned
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Explanation: Since the reaction is highly exothermic.
8. Why is the liquid naphthalene fed through nozzles directly to the bottom of the reactor, in the fluidized bed for phthalic anhydride production?
a) Liquid is immediately vaporized
b) Liquid is immediately cooled
c) Liquid is immediately solidified
d) None of the mentioned
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Explanation: According to Graham and Way, the liquid vaporizes on injecting through nozzle.
9. In the reaction of naphthalene to phthalic anhydride, what is the intermediate formed?
a) Naphthaquinone
b) Nascent oxygen
c) Naphtha-quinine
d) None of the mentioned
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Explanation: Based on the analysis, it was found that naphthaquinone is the reaction intermediate.
10. What are the by-products present in the HCl oxidation process?
a) Chlorine gas, water vapour
b) Ammonia gas
c) Chloroform
d) None of the mentioned
View Answer
Explanation: Based on the analysis of the exit gases, it was found that chlorine gas and water vapour are also present with HCl.
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