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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Mass Transfer
Flash distillation is

Most useful for handling binary systems
Used for multicomponent systems like crude refining
Same as simple distillation
Same as differential distillation

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