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

Viscosity variation of the fluids may cause channeling/flooding
None of these
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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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

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

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