Mass Transfer
Fractional solvent extraction

Employs only one solvent
None of the listed here
Employs two solvents
Results in low interfacial tension

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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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