Fluidization Engineering Questions and Answers – Synthesis Reactions-2

This set of Fluidization Engineering Interview Questions and Answers for Experienced people focuses on “Synthesis Reactions-2”.

1. Why was fluidized bed not used commercially for production of gasoline from natural gas?
a) Conversion was below par
b) Scale-up was difficult
c) Back-mixing
d) All of the mentioned
View Answer

Answer: d
Explanation: Fluidized bed was not possible because of less conversion, scale up problem.

2. Why was conversion in the production of gasoline in fluidized bed was less?
a) Back-mixing and by-passing
b) Recycling
c) Regeneration
d) None of the mentioned
View Answer

Answer: a
Explanation: Back-mixing and by-passing are undesirable for gasoline production.

3. What is the main reason for lower efficiencies in the commercial operations of synthetic reactions through fluidized beds?
a) Gas bypassing
b) Backing mixing
c) Bubble behaviour
d) All of the mentioned
View Answer

Answer: d
Explanation: Serious gas by-passing, back mixing and irregular bubble behaviour leads in lowering the efficiencies in fluidized beds.
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4. Why are electrodes placed in resistance-heated fluidized bed?
a) Achieve high temperatures
b) Acts as heat transfer surface
c) Helps in magnetizing the metallic particles
d) None of the mentioned
View Answer

Answer: a
Explanation: To maintain very high temperatures through passing high density current through electrically conductive material.

5. Operating conditions and feed ratios are different for all these processes, however, conversion of limiting reagent, acetic acid is roughly 50-70%, true or false?
a) True
b) False
View Answer

Answer: a
Explanation: Based on experiments conducted by Du pont company.

6. In the dilute phase reacting system, reacting gases carry suspended catalyst through tubes of a vertical heat exchanger with velocity of?
a) 3 to 12 m/s
b) 12 to 24 m/s
c) 1 to 3 m/s
d) 0.1 to 10 m/s
View Answer

Answer: a
Explanation: This range of velocity provides relevant driving force for smooth circulation of powdered catalyst.

7. What is the mesh range that the catalytic reactor for vinyl acetate developed by Du pont uses?
a) 30 to 150 mesh
b) 150 to 200 mesh
c) 10 to 50 mesh
d) 200 to 300 mesh
View Answer

Answer: a
Explanation: Optimum range to prevent elutrition and avoiding bubble cap blockage.
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8. Kellogg company developed a synthetic gasoline plant based on dilute phase transfer line, works on the principle of circulation system for the solids, true or false?
a) True
b) False
View Answer

Answer: a
Explanation: They developed such fluidized bed which works on principle of circulation system for solids.

9. In Sohio process, after fluidized bed, instead of several separation units, why cant we use a single distillation column?
a) Difficult to separate
b) Economics
c) Space factor
d) None of the mentioned
View Answer

Answer: a
Explanation: Since the boiling points of the end products are very close, distillation columns cannot be used to separate them.
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10. What is the role of cone shaped structure in the Du pont catalytic reactor?
a) Gas distribution
b) To occupy empty space
c) To prevent attrition
d) For better fluidization
View Answer

Answer: a
Explanation: Cone helps in gas distribution for better gas-solid contact and eliminate gas bypassing.

Sanfoundry Global Education & Learning Series – Fluidization Engineering.

To practice all areas of Fluidization Engineering for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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