Mass Transfer
Absorption accompanied with chemical reaction is exemplified by the absorption of

SO₂ in alkaline solution
Benzol present in coke oven gas by wash oil
Ammonia in water
All of these

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with increase in wet bulb temperature
And humidified
At the same relative humidity
And dehumidified with decrease in wet bulb temperature

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Mass Transfer
Priming in a distillation column

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high viscosity to provide high tray efficiency
Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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