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

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

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Mass Transfer
Channelling is most severe

In towers packed with stacked packing
At very high liquid flow rate
In towers packed randomly with crushed solids
In dumped packing of regular units

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