Mass Transfer
The equipment used in the extraction of highly corrosive radio active liquids is

Baffle tower
Mixer settler
Pulse column
Spray column

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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

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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