Scope of application: It is suitable for the purification and desulfurization (removal of H2S) of fuel gas and city gas in various industries such as chemical industry, ceramics, metallurgy, machinery, etc. Reaction principle: (1) Absorption: In the absorption tower, the raw material gas is in countercurrent contact with the desulfurization liquid. Hydrogen sulfide is absorbed by the action of alkali in the solution; H2S+Na2CO3=NaHS+NaHCO3 (2) Sulfur evolution: Hs is oxidized by high-valent metal ions in the reaction tank to become elemental sulfur; NaHS+NaHCO3+2NaVO3=S↓+Na2V2O5+Na2CO3+ At the same time of H2O, the generated low-valent metal ions are immediately oxidized to high-valent metal ions by the quinone; Na2V2O5+Q(quinone)NaCO3+H2O 2NaVO3+HQ(phenol) Regeneration oxidation: the air in the jet regeneration tank oxidizes the phenol state to Quinone state; 2HQ+1/2O2 2Q+H2O The above is that the process is carried out continuously in order to complete the gas desulfurization and purification.