Abstract: In order to improve the efficiency of removing H₂S by wet oxidation, FeCl₃ and CuCl₂ were added into acidic N-methylpyrrolidone solvent to prepare bimetallic organic desulfurization system, and its viscosity, density, chemical structure and thermal stability were measured. The effects of metal salt concentration, temperature and regeneration time on desulfurization and regeneration efficiency were investigated, and the mechanism of desulfurization was analyzed. The results show that the organic wet oxidative desulfurization system containing Fe/Cu bimetallic salt has high efficiency, and the sulfur capacity of static desulfurization can reach 1.65 g/L at atmospheric pressure. The desulfurized product is high purity sulfur without by-products such as thiosulfate and sulfate, and there is no the problem of sewage discharge. Compared with traditional aqueous wet oxidation desulfurization agent, the Fe/Cu bimetallic salt organic desulfurization system has better economic benefits and environmental friendliness.

Key words: hydrogen sulfide removal, bimetallic catalytic oxidation, N-methylpyrrolidone, ionic liquid