Mass Transfer
Fractional solvent extraction

Results in low interfacial tension
Employs two solvents
Employs only one solvent
None of the listed here

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

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

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Reduces the overall pressure drop
Is characterised by the presence of foam throughout the space between trays
Results from very low gas velocity

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