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

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

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly

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