Explanation

The selective dissolution of H2S in exhaust gas is usually achieved through physical absorption, using absorbents to separate H2S from the exhaust gas. Commonly used absorbents include methanol, propylene carbonate, N-methyl-2-pyrrolidone, tributyl phosphate, etc. This process selectively absorbs H2S into the solvent by changing the partial pressure of H2S in the absorbent, and then releases H2S from the solvent through desorption operation. After desorption, the physical absorption liquid can be reused to achieve H2S recovery and waste gas treatment. Physical absorption solvents have high absorption capacity and are suitable for efficient removal of H2S from waste gas. Unlike chemical absorption method, physical absorption method usually does not require the introduction of other chemical reactions, only basic equipment such as absorption tower, flash tank, and circulating pump. This makes the physical absorption method simpler and has a relatively lower operating cost, as it does not require steam or other heat sources. In addition, the physical absorption method usually has less corrosion and pollution to the equipment, so it is an effective waste gas treatment method.

Classification