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
0.7
0.9
0.5

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Mass Transfer
To get high tray efficiency

Liquid entrainment should be severe
Time of contact between the two phases should be less
Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low

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