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

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

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Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Line always lies above the equilibrium curve
Velocity is more than the loading velocity
Line can be either above or below the equilibrium curve

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