Mass Transfer
Flash distillation is

Most useful for handling binary systems
Same as simple distillation
Used for multicomponent systems like crude refining
Same as differential distillation

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

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