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Packed-Bed Absorbers. Packed-bed absorbers are the most common absorbers used for gas removal . The most common packed-bed absorber is the countercurrent-flow tower.
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Packed-Bed Absorbers • Packed-bed absorbers are the most common absorbers used for gas removal. • The most common packed-bed absorber is the countercurrent-flow tower. • Packed-bed absorbers are most suited to applications where high gas removal efficiency is required, and the feed gas stream is relatively free from particulate matter. • The maximum (L/G) in countercurrent flow is limited by flooding, which occurs when the upward force exerted by the gas is sufficient to prevent the liquid from flowing downward. • The minimum (L/G) is fixed by the need to ensure that all of the packing is covered by a thin liquid film.
Solubility • The solubility of a gas in a liquid is a function of the temperature and partial pressure of the contaminant in the gas phase.
Henry’s Law Under certain conditions, the relationship between the gas phase concentration and the liquid phase concentration of the contaminant at equilibrium can be expressed by Henry’s Law. yA = HyxA Where yA= mole fraction of contaminant in gas phase at equilibrium Hy= Henry's Law constant when the gas concentration is expressed in mole fraction xA = mole fraction of contaminant dissolved in the liquid phase at equilibrium
