This set of Distillation Design Multiple Choice Questions & Answers (MCQs) focuses on “Azeotropic Elements”.
1. The azeotrope in the ethanol–water binary system has a composition of ____ ethanol.
a) 89%
b) 59%
c) 88%
d) 99%
View Answer
Explanation: The azeotrope in the ethanol–water binary system has a composition of 89 mole per cent of ethanol, starting with a mixture containing a lower proportion of ethanol.
2. PSD is called?
a) Pressure Straight Desorption
b) Pressure Swing Distillation
c) Pressure Singer Desorption
d) Parameter Swing Distillation
View Answer
Explanation: The pressure swing distillation (PSD) uses the azeotropic composition on the system pressure to break the azeotrope.
3. For easy separation, the relative volatility αi,j tends to?
a) 0
b) 1
c) 1.5
d) 0.5
View Answer
Explanation: The separation at the azeotropic point is not possible, because of the reason that the relative volatility αi,j is equal to one.
4. If the boiling temperature isobar exhibits, an extremal point then mixture is said to be
a) Fully azeotropic
b) Totally azeotropic
c) Tangentially azeotropic
d) Partially azeotropic
View Answer
Explanation: If the boiling temperature isobar exhibits an extremal point located at the pure component edges, i.e., at zero concentration for one or several of the components in the mixture.
5. At constant pressure, there exhibits a nearly extreme point at zero concentration for one or several of the components this point is called?
a) Tangent pitch
b) Elliptical pitch
c) Parabolic pitch
d) Circular pitch
View Answer
Explanation: This phenomenon is also called a tangent pinch, such mixtures are of great practical importance, examples of common tangentially zeotropic mixtures are acetone and water.
6. Positive deviation from Raoult’s law results in?
a) Minimum boiling azeotrope
b) Maximum boiling azeotrope
c) Tangential azeotrope
d) Elliptical azeotrope
View Answer
Explanation: The attraction between identical molecules (A-A and B-B) is stronger than between different molecules (A-B), This may cause the formation of a minimum-boiling azeotrope and heterogeneity.
7. Negative deviation from Raoult’s law results in?
a) Minimum boiling azeotrope
b) Maximum boiling azeotrope
c) Tangential azeotrope
d) Elliptical azeotrope
View Answer
Explanation: The attraction between different molecules (A-B) is the strongest, This may cause the formation of a maximum-boiling azeotrope.
8. Ideal mixture obeys Raoult’s law results in?
a) Minimum boiling azeotrope
b) Maximum boiling azeotrope
c) Tangential azeotrope
d) Ideal azeotropes
View Answer
Explanation: The components have similar physiochemical properties, the intermolecular forces between identical and different molecules (A-A, B-B and A-B) are equal.
9. The most commonly used membrane technology for liquid azeotropic mixtures is?
a) Pervaporation
b) Evaporation
c) De-evaporation
d) Condensation
View Answer
Explanation: The most commonly used membrane technology for liquid azeotropic mixtures is pervaporation with low pressure on the permeate side of the membrane so as to evaporate the permeate.
10. When the entrainer reacts preferentially and reversibly with one of the original mixture components then it is called?
a) Non-Reactive distillation
b) Reactive distillation
c) Extractive distillation
d) Prime distillation
View Answer
Explanation: The reaction product is distilled out from the non-reacting component and the reaction is reversed to recover the initial component, the distillation and reaction is usually carried out in one column.
Sanfoundry Global Education & Learning Series – Distillation Design.
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