Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Solvent of low latent heat of vaporisation should be used
Very small quantity of solvent is required

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases

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Mass Transfer
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

0.7
0.9
0.25
0.5

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