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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Mass Transfer
Priming in a distillation column

Reduces the overall pressure drop
Is characterised by the presence of foam throughout the space between trays
Is desirable from point efficiency consideration
Results from very low gas velocity

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