Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable gas velocity
Feed composition
Allowable liquid velocity
Allowable gas and liquid velocities

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available
One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

None of these
Viscosity variation of the fluids may cause channeling/flooding
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high

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