关键词: 天然气脱硫, 非水相体系, N,N-二甲基甲酰胺, 硫磺

Abstract: A non-aqueous wet oxidation desulfurization system was constructed by introducing SbCl₃ and FeCl₃ into N,N-dimethylformamide (DMF) at a certain ratio. The desulfurizer and its products were characterized, and the absorption rule of this system for H₂S was studied by static desulfurization experiment. The results showed that the sulfur capacity of the desulfurizer could reach 8.91 g/L at normal temperature and pressure, and the addition of an appropriate amount of water and proper heating would facilitate the enhancement of the desulfurization efficiency. After five consecutive desulfurization-regeneration cycles, the sulfur capacity was kept above 90% of the initial sulfur capacity in the presence of Cu²⁺. XRD spectra indicated that the solid product after regeneration was high-purity sulfur. Sb³⁺ was a key component to ensure the effective absorption of H₂S. The presence of a suitable amount of Cu²⁺ could promote the transformation of Fe²⁺ to Fe³⁺ and facilitating the oxidation regeneration of the system.

Key words: natural gas desulfurization, non-aqueous phase system, N,N-dimethylformamide, sulfur