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
Decolouration of yellow glycerene
Dehumidification of air and gas
Removal of objectionable odour and impurities from industrial gases

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Mass Transfer
To get high tray efficiency

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

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