Mass Transfer
Radioactive nuclear waste is treated in

Bollman extractor
Mixer-settler extractor
Rotating-disc contactor
Pulsed column extractor

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Can use any type of units
Uses molal units for material and energy balance
Is more accurate than Ponchan-Savarit method

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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
Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
One of the liquid components is heat sensitive

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