Mass Transfer
Design calculation for multiple component distillation is done by

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

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Mass Transfer
Flights in a rotary dryer are provided to

Reduce the residence time of solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
None of these
Increase the residence time of the solid

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