Mass Transfer
In distillation, overhead product contains

Two components
Any number of components
Only saturated liquid
Only one component

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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system
The overall M.T.C. of the system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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

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