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

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

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Mass Transfer
Channelling is most severe

At very high liquid flow rate
In dumped packing of regular units
In towers packed with stacked packing
In towers packed randomly with crushed solids

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