Mass Transfer
Molecular diffusivity of a liquid

Decreases with temperature
May increase or decrease with temperature
Increases with temperature
Is independent of temperature

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Mass Transfer
McCabe-Thiele method

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

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Mass Transfer
The wetted wall tower is used to determine

The overall M.T.C. of the system
M.T.C. of individual components in a liquid-liquid system
M.T.C. of liquid in liquid-gas system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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