This set of Distillation Design Multiple Choice Questions & Answers (MCQs) focuses on “Process Design and Optimization”.
1. Tray efficiency correspondingly depends upon?
a) Column Diameter
b) Column throughput
c) Column length
d) Column feed
View Answer
Explanation: Tray efficiency depends upon column throughput and velocity depends upon the Column Diameter.
2. When a minor fraction of liquid flows to the tray below through the tray perforations it is called
a) Weeping
b) Dumping
c) Entrainment
d) Feeding
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Explanation: During weeping, a minor fraction of liquid flows to the tray below through the tray perforations.
3. When distillate contains highest possibility of light key, D/F approaches
a) Infinity
b) Zero
c) Unity
d) Double
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Explanation: When distillate contains highest possibility of light key D/F approaches Unity and lowest when D/F approaches Zero.
4. At higher recovery _____ distillate is produced.
a) Low
b) More
c) Finite
d) Unwanted
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Explanation: At higher recovery ¬¬¬¬More distillate is produced but of lower purity. At a lower recovery the relation follows an inverse character.
5. The vertical D/F line indicated the
a) Maximum impurity level
b) Minimum impurity level
c) More separation
d) Less separation
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Explanation: The vertical D/F line indicated the Maximum impurity level at that point on the curve, and this should has to be minimized for better operations.
6. The material balance optimization is also referred as
a) L V optimization
b) B D optimization
c) D B optimization
d) V L optimization
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Explanation: D B is optimization at a fixed recovery and L V optimization is done for the matching of feed rates.
7. Raising the column pressure, results in
a) Lower relative volatility
b) Higher relative volatility
c) No effect
d) Higher boiling point
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Explanation: The unfavorable effects of raising column pressure is that it lowers relative volatility and thus discarding the products formation.
8. What does DCF represents?
a) Distillation Corp Factor
b) Damping Correction Factor
c) Down Comer Flow
d) Discounted Cash flow
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Explanation: DCF is used for estimating payout period, while down comer flow is a physical quantity of column.
9. What does RVP Stands For?
a) Reid Vapor pressure
b) Reflux vapor pressure
c) Reid Viscous Parameter
d) Right Vary Parameter
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Explanation: It is a physical property representing Reid Vapor pressure, while for performing reflux operations the Reflux vapor pressure is considered.
10. Energy balance optimization is a prime factor for setting
a) Operations
b) Cost
c) Reflux
d) Feed
View Answer
Explanation: Unlike Material balance optimization, Energy balance optimization can be used for the setting of a distillation column.
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