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Distillation Design Mcqs

Q:

Acetone and methanol form a binary minimum-boiling azeotrope, of about?

A) 75.8% acetone B) 80% acetone
C) 70% acetone D) 50% acetone
 
Answer & Explanation Answer: A) 75.8% acetone

Explanation: Acetone and methanol form a binary minimum-boiling azeotrope of about 78.5 mole % acetone, Water is miscible and zeotropic in the whole composition space.

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Q:

Extractive distillation of ethanol and water is done using?

A) Benzene B) Ethylene glycol
C) Alcohol D) Any acid
 
Answer & Explanation Answer: B) Ethylene glycol

Explanation: Extractive distillation of ethanol and water using ethylene glycol as an entrainer is a classic example in the distillation literature.

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42
Q:

When x = C(y), where C is?

A) Inverse function B) Mapping function
C) Entrainment function D) Flooding Function
 
Answer & Explanation Answer: A) Inverse function

Explanation: Here, C is the inverse equilibrium mapping function that assigns a composition in the vapor phase to the corresponding equilibrium liquid phase composition.

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Q:

When y = E(x), where E is?

A) Mapping function B) Entity function
C) Frequency function D) Phase function
 
Answer & Explanation Answer: A) Mapping function

Explanation: E is the equilibrium mapping function that assigns a composition in the liquid phase to the corresponding equilibrium vapor phase composition, and Tbp and Tdp are the mixture boiling temperature.

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33
Q:

The vapor-liquid equilibrium (VLE) condition which may be expressed as?

A) y = f (S, H, T) B) y = f (P, T, x)
C) x = f (T, S) D) y = f (J, S)
 
Answer & Explanation Answer: B) y = f (P, T, x)

Explanation: Where x and y are the liquid and vapor compositions, and P and T are the system pressure and temperature, respectively T and x are not independent at the equilibrium state.

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45
Q:

Separating a maximum-boiling azeotrope using a light entrainer, this process is referred to as?

A) Re-extractive distillation B) De-extractive distillation
C) Extractive distillation D) Boil up distillation
 
Answer & Explanation Answer: A) Re-extractive distillation

Explanation: The same extractive distillation scheme can in principle be applied to the symmetrical system of
separating a maximum-boiling azeotrope using a light entrainer and this process is referred to as re-extractive distillation.

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Q:

A greater entrainer flowrate generally, yields better

A) Reflux B) Boil up
C) Hold up D) Separation
 
Answer & Explanation Answer: D) Separation

Explanation: A greater entrainer flowrate generally yields better separation, but this increases the energy demand in both columns and increases the reboiler temperature in the extractive column.

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38
Q:

Heteroazeotropic (VLLE) distillation, often referred to as?

A) Azeotropic distillation B) Exractive distilllaton
C) Batch Ditilation D) Continous Distillation
 
Answer & Explanation Answer: A) Azeotropic distillation

Explanation: Heteroazeotropic (VLLE) distillation, often referred to as azeotropic distillation, involves the formation of a heteroazeotrope to affect the desired separation.

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