Mass Transfer
Flash distillation is

Same as differential distillation
Used for multicomponent systems like crude refining
Same as simple distillation
Most useful for handling binary systems

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

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

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