Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Both liquids flow at fixed rate
Liquid's flow rate depends upon the temperature and pressure
Only one of the liquids may be pumped at any desired rate

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Mass Transfer
Flash distillation is

Same as simple distillation
Same as differential distillation
Used for multicomponent systems like crude refining
Most useful for handling binary systems

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