Mass Transfer
Flooding in a column results due to

High pressure drop
Low velocity of the liquid
Low pressure drop
High temperature

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

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