Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases
Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases

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Mass Transfer
Henry's law states that the

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

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Mass Transfer
McCabe-Thiele method

Can use any type of units
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition

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