Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low latent heat of vaporisation should be used
Large quantity of solvent is required to extract the solute
Solvent of low freezing point should be used
Very small quantity of solvent is required

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality
Relative volatility is reasonably constant

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