Mass Transfer
Flooding in a column results due to

Low pressure drop
High temperature
Low velocity of the liquid
High pressure drop

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

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

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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

0.5
0.9
0.25
0.7

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