Abstract: Based on the composition of hydrogenation process tail gas for the sulfur recovery unit, the compound solvent CT8-26 with outstanding H₂S removal ability was developed. The results of laboratory tests showed that the H₂S concentration in purified gas reduced over 70% after using CT 8-26 solvent, compared with MDEA. By using the CT8-26 solvent system, the H₂S mass concentration in purified tail gas can be reduced to less than 30 mg/m³ or 10 mg/m³ for the hydrogenation process tail gas of sulfur recovery unit in natural gas purification plants and in refineries, respectively.