Mass Transfer
To get high tray efficiency

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

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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
0.5
0.25
0.9

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