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
Very small quantity of solvent is required
Solvent of low freezing point should be used

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Both A & B
Pr = Sc ; there won

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