Mass Transfer
For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be

Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Lewis number is close to unity
Solubility of the components of air in water is very small
Water has a high latent heat of evaporation
They are always equal under all circumstances

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

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

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