Mass Transfer
Design calculation for multiple component distillation is done by

Tray to tray calculations
Mccabe-Thiele method
Enthalpy concentration method
Ponchon-Savarit method

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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

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

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