WorksheetsMulti stages LLE
Total questions: 10
Worksheet time: 7mins
Why must the two main liquids (solvent and carrier) used in liquid–liquid extraction be immiscible?
To ensure both liquids form a single homogeneous phase
To allow the solute to distribute between two separate phases
To increase the boiling point of the mixture
To prevent the formation of tie lines in the triangular diagram
In an equilateral triangular diagram, what does each vertex represent?
A solvent solute pair
A binary mixture
A pure component
A one phase region
If the top vertex represents component B, how is the mole fraction of B read?
From the right side of the triangle
From the base opposite to vertex B
From the left side of the triangle
From the intersection of all three lines
A point inside the equilateral triangle is located where the red, blue, and green lines intersect at 60% B, 20% A, and 20% C. What does this point represent?
A pure component
An azeotropic point
A binary mixture
A ternary mixture
On the right side of the equilateral triangular diagram (between B and C), what kind of mixture is represented?
Ternary mixture of A, B, and C
Pure component
Binary mixture of A and B
Binary mixture of B and C
In the triangular diagram, what does the Plait Point represent?
The point where extract and raffinate compositions become identical
The point where solvent is completely pure
The point of maximum solute concentration
The intersection of tie lines with operating line
What does the Operating Point (Δ) indicate in the triangular diagram?
The starting point of solute distribution
The end point of the extraction stages
The material balance condition for the system
The solvent composition at equilibrium
In this diagram, component labels are:
Acetone = Solute
TCE = Solvent
Water = Carrier/Diluent
Which of the following is correct?
Top vertex = Solute, Right vertex = Solvent, Left vertex = Carrier
Top vertex = Carrier, Right vertex = Solute, Left vertex = Solvent
Top vertex = Solute, Right vertex = Carrier, Left vertex = Solvent
Top vertex = Solvent, Right vertex = Carrier, Left vertex = Solute
What is the first step in determining the minimum solvent rate from the ternary diagram?
Step off the number of stages
Locate the positions of the solvent and the feed
Draw the operating line
Locate the plait point
Why is determining the minimum solvent rate important in liquid–liquid extraction design?
IIt avoids formation of azeotropes
It ensures complete miscibility of solvent and carrier
It reduces solvent consumption while still achieving separation
It maximizes the number of equilibrium stages required
