What is the principle of the acid absorption method?
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What is the principle of the acid absorption method?
Nitrogen removal by acid absorption refers to a nitrogen oxide pollution control technique that uses concentrated sulfuric acid or dilute hydrochloric acid as absorbents. When NOX is absorbed by concentrated sulfuric acid, nitrososulfuric acid is formed: NO + NO2 + 2 H2SO4 (concentrated) → 2 HNO2HSO4 + H2O. Nitrososulfuric acid can be used to produce sulfuric acid and concentrated sulfuric acid. In enterprises that produce both concentrated sulfuric acid and concentrated *ao acid simultaneously, this technology can be used to purify NOX-containing exhaust gases. The absorption of NOX by dilute sulfuric acid is a form of physical absorption, and it is commonly used to purify exhaust gases from sulfuric acid plants, with a purification efficiency of up to 90%. In addition to temperature and pressure, the concentration of dilute acid is an important factor affecting absorption efficiency. *The absorption efficiency is high when the acid concentration is 15-20%. After absorbing NOX, the *ao acid is heated, and secondary air is used to blow out the NOX; the blown-out NOX can be returned to the *ao acid absorption tower for further absorption. After the NOX has been removed, the *ao acid is cooled to 293 K and sent to the exhaust gas absorption tower for reuse.
It’s probably acid-base neutralization, as well as the solubility in polar media.
Basic principle of acid absorption: When a certain acidic liquid is used to treat a gas mixture, during the gas-liquid contact process, the different components in the gas mixture have varying solubilities in that same acidic liquid. One or more components with high solubility will dissolve into the liquid phase, thereby changing the relative concentrations of the various components in the gas phase; as a result, the mixed gas is separated and purified. This process is known as acid absorption. Such as using acid solutions to absorb ammonia, or concentrated sulfuric acid or dilute hydrochloric acid as absorbents to absorb nitrogen oxides, etc