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

Number of plates decreases very slowly first and then more and more rapidly
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

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be increased
Gas side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant
Liquid side mass transfer co-efficient should be decreased

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