Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

The top and bottom compositions correspond to the maximum enrichment available
The top and bottom compositions are unchanged with and without total reflux
Reboiler load and condenser load are minimum
Composition of vapors and that of liquid do not vary throughout the column

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Mass Transfer
Plate efficiency

Is a function of the mass transfer between liquid and vapour
Increases due to liquid entrainment
Increases due to foaming
Increases due to weeping and dumping of liquid

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