Mass Transfer
HETP is numerically equal to HTU, only when the operating line

And equilibrium lines are parallel
Is far from the equilibrium line
Lies above the equilibrium line
Lies below the equilibrium line

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Mass Transfer
Priming in a distillation column

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of these
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Temperature of the liquid phase is equal to that of the vapor phase

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