Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

No reflux
Minimum reflux ratio
Total reflux
Zero reflux ratio

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

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