Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components has very high affinity towards the solvent
Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high
One of the liquid components is heat sensitive

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Relative volatility is reasonably constant
Multicomponent distillation is involved
Mixture (to be separated) shows positive deviation from ideality
Mixture (to be separated) shows negative deviation from ideality

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Mass Transfer
Bollman extractor

Is used for extraction of oil from oilseed
Is a static bed leaching equipment
Is a centrifugal extractor
Employs only counter-current extraction

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