关键词: 共沉淀法, 常温锌基脱硫剂, 硫化氢

Abstract: Under the background of rapid development of polypropylene industry in China, sulfur, as a harmful impurity in the propylene polymerization, has a negative effect on the quality of polypropylene product and the normal operation of the plant, therefore, how to effectively remove harmful impurities such as sulfur in propylene has become a key problem. This study utilized the co-precipitation method, employing zinc nitrate hexahydrate [Zn(NO₃)₂.6H₂O] and aluminum chloride hexahydrate (AlCl₃.6H₂O) as the active component and carrier, respectively, with sodium carbonate (Na₂CO₃) as the precipitant, to successfully develop an efficient zinc-based room temperature desulfurizer. After single-factor experiments,the optimum conditions were determined as follows:a reaction temperature of 60℃,a molar ratio of zinc to aluminum of 4:1, a molar ratio of zinc and aluminum to precipitator of 1:1.3,a concentration of zinc salt of 0.75 mol/L and a calcination temperature of 300℃.The permeation capacity of the desulfurizer reached 22.69%. Further analyses revealed that the precursor of the desulfurizer was basic zinc carbonate. The optimum calcination temperature was 300 ℃, at which the desulfurization activity was the highest (penetration sulfur capacity was 22.69%) and the pore structure and properties were excellent (specific surface area of 67.63 m²/g, pore volume of 0.202 cm³/g, average pore diameter of 10.94 nm). The performance evaluation at 25℃showed that the desulfurizer exhibited excellent desulfurization effect, with a penetration time of 600 min and a penetration capacity of 23.17%.

Key words: coprecipitation method, zinc-based room temperature desulfurizer, hydrogen sulfide