Mass Transfer
In an operating distillation column, the

Driving force for the liquid flow is its specific weight
Vapors and liquids are at their dew point and bubble point respectively
Highest temperature is encountered at the top of the column
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column

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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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