Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
Viscosity of liquid components is very high
Extracting solvent is cheaply & abundantly available
One of the liquid components has very high affinity towards the solvent

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Is computed from the intercept of the operating line
Is the optimum reflux ratio
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Cannot be computed

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

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