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

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

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Mass Transfer
The wetted wall tower is used to determine

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

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