A. Fractional crystallisation
B. Liquid extraction
C. Absorption
D. Evaporation
Related Mcqs:
- 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% - If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that___________________?
A. The system comprises of partially miscible liquids
B. The system comprises of miscible liquids
C. The system comprises of an azeotrope
D. On heating, a vapor phase will appear; while on cooling, a solid phase will appear - 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 - 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 - Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?
A. 5.6 × 10-4
B. 8.5 × 10-4
C. 5.6 × 10-3
D. 8.5 × 10-3 - The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?
A. Increasing the gas film co-efficient
B. Increasing the liquid film co-efficient
C. Increasing the total pressure
D. Decreasing the total pressure - The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will______________________?
A. Increase
B. Decrease
C. Remain same
D. Depend on saturated boiling point; may increase or decrease - Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their____________________?
A. Viscosity
B. Density
C. Solubility
D. Relative volatility - A coalescer in a mixer-settler liquid-liquid extraction column______________________?
A. Comprises of thin bed of substances of extended surface having high porosity
B. Helps in increasing the bubble size entering the settler
C. Helps in increasing the settling rate of the bubbles
D. All ‘a’, ‘b’, & ‘c’ - 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.
