Mass Transfer
Minimum reflux ratio in a distillation column results in

Maximum condenser size
Optimum number of trays
Minimum reboiler size
Minimum number of trays

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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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