Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Have very close boiling points
Form minimum boiling azeotrope
Form constant boiling azeotrope
Have very wide boiling points

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

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

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