Mass Transfer
Priming in a distillation column

Is characterised by the presence of foam throughout the space between trays
Is desirable from point efficiency consideration
Results from very low gas velocity
Reduces the overall pressure drop

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Mass Transfer
To get high tray efficiency

Liquid entrainment should be severe
Gas velocity should be very low
Time of contact between the two phases should be less
Interfacial surface between liquid and gas phase should be large

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

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

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