Critical Analysis of Harmful Gases from Flue Gas

DOI : http://dx.doi.org/10.13005/bbra/1389

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The invention provides a wet, regenerable scrubbing process using ammonium hydroxide (NH4OH) solution to remove acid anhydride moiety gases, and trace amounts of hydrogen chloride gas (HCl) and hydrogen fluoride (HF) gas in a gas-liquid contacting reactor. In particular, the invention uses “aqua ammonia” or an aqueous ammonia scrubbing liquor such as [NH3 (aq)/ammonium hydroxide (NH4OH)] to extract certain effluent compounds via acid-base or neutralization reactions. Generally, an effluent gas is subjected to chemical scrubbing with aqueous ammonia or some other ammoniacontaining compound in a gas-liquid contactor reactor or a scrubber to remove gaseous acid anhydride moieties. The chemical scrubbing produces ammonium salts of the conjugate bases of the acid anhydride moieties. Thermal regeneration of the ammonia scrubbing liquor occurs in an adjacent vessel or remotely.

Harmful gases; Flue gas; regenerable scrubbing process