What is the principle of a gas hydrogen sulfide removal tower?

A certain amount of steam is introduced at the bottom, and under specific pressure and temperature conditions, H2S in the medium is stripped and evaporated.

Reply 1# yuni: For the removal of hydrogen sulfide from natural gas, as well as from refinery dry gas and liquefied gas, the alkoxy alcohol amine chemical absorption method is generally used. In this method, the weak organic base N-methyldiethanolamine (MDEA) is used as the absorbent, which comes into countercurrent contact with the feed gas in an absorption tower to absorb H2S and CO2 from the gas, thereby purifying the feed gas； The amine-rich liquid that has absorbed H2S and CO2 is sent to the solvent regeneration tower, where it is decomposed under high temperature and low pressure to release acidic gases such as H2S and CO2. This reversible chemical reaction is used to regenerate the amine-rich liquid into an amine-poor liquid, which is then sent back to the absorption tower as an absorbent for reuse. The chemical reaction equations are as follows: Reaction with H2S: 2MeNR2 + H2S ↔ (MeNHR2)2S; (MeNHR2)2S + H2S ↔ 2(MeNHR2)HS. Reaction with CO2: 2MeNR2 + CO2 + H2O ↔ (MeNHR2)2CO3; (MeNHR2)2CO3 + CO2 + H2O ↔ 2(MeNHR2)HCO3