Mass Transfer
The vapour pressure exerted by the moisture contained in a wet solid depends upon the

Nature of the moisture
Temperature
Nature of the solid
All of these

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
Reboiler load and condenser load are minimum
Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions are unchanged with and without total reflux

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Mass Transfer
Priming in a distillation column

Is characterised by the presence of foam throughout the space between trays
Results from very low gas velocity
Reduces the overall pressure drop
Is desirable from point efficiency consideration

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