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Worksheetsoperation separation 2023
Total questions: 21
Worksheet time: 1hrs 18mins
Why use Fenske equation?
maximum theoretical plate number
minimum theoretical plate number
minimum theoretical stage number
Refinate is the……………………………………………………
Solvent-rich phase.
rich phase with the feed liquid separated from the extractor.
non- rich phase with the feed liquid separated from the extractor.
Extraction is the process of …………………………………..
removing a substance or unwanted impurities from two or multi-component mixtures without the help of solvent.
removing a substance or unwanted impurities from multi-component mixtures with the help of solvent.
removing a substance or unwanted impurities from two or multi-component mixtures with the help of solvent.
In a distillation column, …
top product is rich in more volatile and bottom product is rich in less volatile.
top product is rich in less volatile and bottom product is rich in more volatile.
top product is rich in non-volatile and bottom product is rich in volatile.
I. The greater distance from equilibrium curve and diagonal, the greater the difference in liquid and vapor compositions and the easier the separation by distillation.
II. A relative volatility is less than one then is probably upside down and the more volatile component is in the denominator.
III. Relative volatility is generally a less stronger function of temperature than the component vapor pressures.
Which statement(s) about relative volatility is(are) TRUE?
II
I,II,III
I, III
Which of the following is not a step in the process of distillation?
Condensation
Precipitation
Vaporization
Which of the following definition is TRUE?
Absorption denotes the dissolution of gaseous substances (absorptives) in a liquid (absorbent, solvent, washing agent). The reversed process is called desorption.
Absorption denotes the dissolution of gaseous substances (absorptives) in a liquid (absorbent, solvent, washing agent). The reversed process is called adsorption.
Absorption denotes the dissolution of gaseous substances (absorptives) without a liquid (absorbent, solvent, washing agent). The reversed process is called desorption.
For an ideal mixture, if the equilibrium temperature decreases, the volatile component fraction in the vapor:
Always increases.
Stays constant.
Always decreases.
In the McCabe-Thiele method, for a feed (mixture of saturated steam and liquid), a higher steam fraction implies that the feed line:
Intersects the origin at a higher ordinate.
Has a lower negative slope.
It becomes more vertical.
During an instantaneous distillation operation, if we increase the relative amount of residual liquid (W), the volatile component fraction in the distillate is:
High
Less
Same
Which of the following is not the advantage of batch distillation?
Batch distillation is permits better product integrity to be achieved.
Batch distillation is flexible in accommodating changes in product formulation, changes in production rate, changes in feed composition.
Batch distillation provides a continuous conversion and efficiency
What is the feed line?
The line that is the fraction of the feed that characterizes the enthalpy of the feed and evaporates at the feed stage.
The line that is the fraction of the feed that characterizes the internal energy of the feed and evaporates at the feed stage.
The line that is the fraction of the feed that characterizes the entropy of the feed and evaporates at the feed stage.
Which of the following is the step of flash distillation?
A liquid mixture feed is pumped through a heater to raise the temperature and enthalpy of the mixture. It then flows through a valve and the pressure is reduced, causing the liquid to partially vaporize.
A liquid mixture feed is pumped through a heater to raise the temperature and entropy of the mixture. It then flows through a valve and causes the liquid to partially evaporate by increasing the pressure.
A liquid mixture feed is pumped through a heater to raise the temperature and internal energy of the mixture It then flows through a valve and increases the pressure, causing the liquid to completely evaporate.
1. What is the goal of distillation?
To produce a distillate rich in light key and the bottoms product rich in high key
To produce a distillate rich in high key and the bottoms product rich in light key
To produce a distillate rich in light key and the bottoms product rich in light key
To produce a distillate rich in high key and the bottoms product rich in high key
1. When is the liquid-liquid extraction preferred over distillation?
When the distillation apparatus is not available
Distillation apparatus is costly
When there too very high difference in the boiling points.
When the liquid mixture is temperature sensitive
1. Which of the following techniques is not used when the boiling point difference is too small?
Crystallization
Adsorption
Distillation
Extraction
How is the equilibrium data may be obtained?
by experiment
by thermodynamic calculation
in published sources
all answers are correct
What are the types of Extraction?
Liquid-Liquid Extraction, Solid-Vapour Extraction
Liquid-Vapour Extraction, Solid-Liquid Extraction
Liquid-Liquid Extraction, Solid-Liquid Extraction
Liquid-Liquid Extraction, Solid-Solid Extraction
Which of the following is correct definition of bubble point?
Boiling point
Temperature at which bubbles start
Temperature at which pressure of bubbles is highest
Temperature at which first bubble comes
What is the correct definition of dew point?
The point at which first drop of gas boils
The point at which the first drop of liquid boils
The point at which the first drop of gas condenses
The point at which the bubble comes
1. When is the liquid-liquid extraction preferred over distillation?
When the distillation apparatus is not available
Distillation apparatus is costly
When there too very high difference in the boiling points.
When the liquid mixture is temperature sensitive
