Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Operating line lies below the equilibrium line
Pressure drop in the column is very high
Operating line lies above the equilibrium line
Both operating and equilibrium lines are parallel

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Mass Transfer
The McCabe Δ L law states that the

Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate depends on the crystal size
Linear crystal growth rate does not depend on the crystal size

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