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

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

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

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