载铜5A分子筛在汽油模拟体系中脱硫性能的研究

近年,美国环保局计划将汽油中硫的质量分数从当前的300×10-6降到2006年的30×10-6,欧盟也已经通过了新的汽油硫质量分数标准为30×10-6~50×10-6,德国甚至提出计划使用无硫汽油1]。中国汽油硫的质量分数高达800×10-6以上,与世界汽油品质距离甚远。因此汽油中硫化物的脱除成为当务之急。目前,脱硫技术主要有催化裂化脱硫、催化加氢脱硫、水蒸气脱硫、生物催化脱硫、吸附精制脱硫、氧化脱硫等2~5]。吸附精制法具有净化度高、能耗低、易于操作等优点,高效的脱硫吸附剂制备是过程开发的关键。负载金属离子的活性纤维是脱除汽油中硫醇的一种…

Desulfurization of model gasoline by 5A molecular sieves loaded with Cu2+

The desulfurization of model gasoline by 5A molecular sieves loaded with Cu2+ was studied. Several factors which influence the desulfurization capability, including temperature, Cu2+ loading, baking temperature, as well as the ethanethiol concentration were investigated. In the range of adsorption temperature of 20℃~45℃, it was found that the sorption capacity of ethanethiol on 5A molecular sieves loaded with Cu2+ increases with the temperature increasing. The desulfurization is enhanced by increasing the Cu2+ loading and the best result is obtained at the Cu2+ loading of 0.16mol/L. Baking of the sorbent can also improve the desulfurization capability, and the optimum baking temperature is 300℃. Two methods of the sorbent regeneration were compared in the experiment，the regeneration by baking is better than that by alcohol washing.