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

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

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

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

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