A. Higher contact area
B. Better contact of the phase
C. Repeated coalescence & redispersion of the drop phase
D. None of these
Related Mcqs:
- In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
A. The entire amount of C is transferred to solvent B
B. Less than 2 kg but more than 1 kg of C is transferred to solvent B
C. Less than 1 kg of C is transferred to B
D. No amount of C is transferred to B - Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?
A. 25%
B. 50%
C. 70%
D. 90% - The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?
A. Low pressure drop and high hold up
B. High pressure drop and low hold up
C. Low pressure drop and low hold up
D. High pressure drop and high hold up - Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?
A. Packing may be crushed due to thermal expansion/contraction of the components of the
equipments
B. Pressure drop in the equipment will be very high
C. Viscosity variation of the fluids may cause channelling/flooding
D. None of these - Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?
A. Extracting solvent is cheaply & abundantly available
B. One of the liquid components is heat sensitive
C. Viscosity of liquid components is very high
D. One of the liquid components has very high affinity towards the solvent - Selectivity of the solvent used in solvent extraction should be)_________________?
A. 1
B. > 1
C. < 1
D. 0 - With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?
A. Increases
B. Decreases
C. Remain unaffected
D. Increases Linearly - Extraction of penicillin employs a ________________ extraction column?
A. Centrifugal
B. Packed
C. Plate
D. None of these - The commonly used solvent in supercritical extraction is_____________________?
A. Methyl ethyl ketone
B. Water
C. Carbon tetrachloride
D. Carbon dioxide - The solvent used in liquid-liquid extraction should have _______________ less than one?
A. Selectivity
B. Distribution co-efficient
C. Both A. and B.
D. Neither A. nor B.
