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

Very small quantity of solvent is required
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

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Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Velocity is more than the loading velocity
Line can be either above or below the equilibrium curve
Line always lies above the equilibrium curve

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