Mass Transfer
Design calculation for multiple component distillation is done by

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

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure

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