Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Form constant boiling azeotrope
Have very wide boiling points
Form minimum boiling azeotrope
Have very close boiling points

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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
Slope of the operating line in stripping section decreases
Total cost first decreases and then increases
Liquid flow increases while the vapor flow decreases for a system

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