Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Less number of trays
Low reflux ratio
Small cross-section column
High reflux ratio

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Mass Transfer
In a counter-current liquid extractor

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

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