Mass Transfer
Raschig ring made of procelain cannot be used for treating concentrated

Nitric acid
Sulphuric acid
Alkalis
Hydrochloric acid

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Mass Transfer
In case of a desorber (stripper), the

Temperature always increases
Operating line always lies above the equilibrium curve
Temperature remains unaffected
Operating line always lies below the equilibrium curve

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Uses molal units for material and energy balance
Is more accurate than Ponchan-Savarit method
Can use any type of units

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