A. Distillation
B. Solvent extraction
C. Absorption
D. None of these
Related Mcqs:
- In liquid extraction, if the selectivity is unity, then__________________?
A. Separation of the constituents is the most effective
B. No separation will occur
C. Amount of solvent required will be minimum
D. Solvent flow rate should be very low - In liquid extraction, if the selectivity is unity, then___________________?
A. Separation of the constituents is the most effective
B. No separation will occur
C. Amount of solvent required will be minimum
D. Solvent flow rate should be very low - Selectivity of the solvent used in solvent extraction should be)_________________?
A. 1
B. > 1
C. < 1
D. 0 - Which of the following unit operations makes use of Thiele-Geddes equation ?
A. Liquid-liquid extraction
B. Solid-liquid extraction
C. Multi-component absorption with chemical reaction
D. Multi-component distillation - For which of the following unit operations, Lewis number is of significance ?
A. Adsorption
B. Binary distillation
C. Gas absorption
D. Humidification - Which of the following operations does not involve leaching ?
A. Dissolving gold from ores
B. Dissolving pharmaceutical products from bark or roots
C. Dissolving sugar from the cells of the beet
D. Removing nicotine from its water solution by kerosene - H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?
A. 2.0
B. 1.56
C. 1.0
D. 0.56 - For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?
A. G/(FG . a)
B. FG/(G . a)
C. (G . a)/FG
D. L/(FG . G) - 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% - pertaining to the analogy between equations of heat and mass transfer operations ?
Pick out the wrong statement
A. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
B. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
C. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
D. Reynolds number remains the same in both heat and mass transfer