Steam distillation is not recommended to be used, if the

A Azeotropic mixture is to be separated and the final product is miscible with water
B Liquids decompose, if distilled directly at atmospheric pressure
C Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
D Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

Correct Answer: Azeotropic mixture is to be separated and the final product is miscible with water

Bissoy MCQ
#Chemical Engineering #Mass Transfer

Related Questions

If the amount of the steam used in steam distillation is increased, the temperature of distillation
A Increases
B Decreases
C Remains unchanged
D Depends on relative volatility
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because
A Temperature is less
B Total pressure is less
C Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
D Saturated steam is used for steam distillation
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
A Raising the temperature
B Lowering the total pressure
C Both A & B
D Neither A nor B
Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
A Cost
B Availability
C Toxicity
D Selectivity
A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
A Back pressure turbine
B Pass out turbine
C Low pressure turbine
D Impulse turbine
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400
In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
A 10 atmospheres
B 20 atmospheres
C 30 atmospheres
D 40 atmospheres
Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha?
A 1.5:1
B 3.5:1
C 10:1
D 15:1
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
A 2.5
B 5
C 12.5
D 17.5
Steam distillation is used for separation of high boiling
A Substances from non-volatile impurities
B Volatile impurity from still higher boiling substances
C Both A & B
D Neither A nor B

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