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

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

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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of individual components in a liquid-liquid system
M.T.C. of liquid in liquid-gas system
Individual mass transfer co-efficient (M.T.C.) in gaseous system
The overall M.T.C. of the system

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