Mass Transfer
Inside the distillation column, the

Pressure increases gradually from bottom to the top of the column
None of these
Liquids are not always at their bubble points
Driving force for the vapour flow is the pressure drop

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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

0.25
0.9
0.7
0.5

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