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
Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high
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 the optimum reflux ratio
Cannot be computed
Is computed from the intercept of the operating line
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve

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