Mass Transfer
Inside the distillation columns, the

All of these
Vapors are not always at their dew points
Driving force for the liquid flow is its weight
Highest temperatures is near the feed plate

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

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