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Design of Industrial Exhaust Systems

Absorbers: Absorbers remove soluble or chemically reactive gases from an air stream by contact with a suitable liquid. While all designs utilize intimate contact between the gaseous contaminant and the absorbent, different brands vary widely in configuration and performance. Removal may be by absorption if the gas solubility and vapor pressure promote absorption or chemical reaction. Water is the most frequently used absorbent, but additives are frequently required. Occasionally other chemical solutions must be used. Packed towers (Figure 4-14) are typical absorbers. 4.6.2 Adsorbers: Adsorbers remove contaminants by collection on a solid. No chemical reaction is involved as adsorption is a physical process where molecules of a gas adhere to surfaces of the solid adsorbent. Activated carbon or molecular sieves are popular adsorbents.