Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
Same as the Murphree efficiency
Always more than the point efficiency
The ratio of number of ideal plates to actual plates

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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
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Highest temperature is encountered at the top of the column

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