Mass Transfer
Flash distillation is

Used for multicomponent systems like crude refining
Most useful for handling binary systems
Same as differential distillation
Same as simple distillation

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Mass Transfer
In an operating distillation column, the

Driving force for the liquid flow is its specific weight
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
Vapors and liquids are at their dew point and bubble point respectively

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