Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Small downcomer liquid seal
Liquid gradient on the tray
Lower skirt clearance
Lower static submergence

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Process Equipment and Plant Design
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the

Both A & B
Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
Neither A nor B
Economic limit reached, when the plant cost exceeds the saving of steam

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