Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Line can be either above or below the equilibrium curve
Velocity is more than the loading velocity
Line always lies above the equilibrium curve

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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 is heat sensitive
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

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