Mass Transfer
In an operating distillation column, the

Vapors and liquids are at their dew point and bubble point respectively
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

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Mass Transfer
Which of the following processes is not an example of adsorption applied to gaseous separations?

Dehumidification of air and gas
Removal of objectionable odour and impurities from industrial gases
Recovery of valuable solvent vapors from dilute mixture with air and other gases
Decolouration of yellow glycerene

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