Study On Removal Of Sulfur From FCC Gasoline

Recently, with the rapid development of economy in the world, the living level of all countries enhances increasingly, and people have high requirements of the environment.The clean fuel oils meeting the requirements of environmental protection in refining industry have already become the general trend.The selective adsorption desulphurization, oxidation desulphurization, et al, have become a promising desulfurization technology. However, a global problem is that the quality of crude oil (FCC) is poor and inferior. So a single desulfurization technology is difficult to carry out depth desulphurization to meet environmental requirements. Composite desulphurization skills and new desulphurization methods show good desulphurization effects.In this paper we prepare modified adsorbents with metal ion (M/AC and M/NaY molecular sieve), used for FCC gasoline adsorption desulphurization. According to desulphurization effect, the best adsorbent Cu+/AC was selected. And it was employed as the adsorbent of the experiment with gasoline pretreatment in 30℃,6 h, agent gasoline ratio of 1:1. Meanwhile WO3/SBA-15 catalysts were prepared by using H2WO4 and H2C2O4 as tungsten source and characterized. And as for real FCC gasoline (850μg/g), adsorption-oxidation and extraction were conducted to inspect and optimize the desulfurization experimental conditions in detail. The results show that the SBA-15 mesoporous material with large surface area and bore diameter is an ideal catalyst carrier. WO3 which could highly disseminate on the carrier exhibited better catalytic activity and stability. Under the conditions of the reaction temperature 333K, reaction time 90 min, pretreatment FCC gasoline 10 mL, catalyst dosage 0.16 g, hydrogen peroxide solution 0.5 mL, extraction solvent and gasoline volume ratio 1, extraction time 30min, desulphurization rate could reach 87.85%.At the same time the other work as follows:(1) The desulphurization performance of ionic liquids was examined about the FCC gasoline on extraction desulphurization experiment. The results display single stage desulfurization rate is 54.85%, multilevel extraction (5-6 times) desulfurization rate could reach 95%. (2) Ionic liquid extraction desulfurization experimental conditions were optimizated and the 1-butyl-3-methyl iminazole tetra-fluorine borates extracting agent, reaction time, reaction temperature, water content on the influence of desulphurization rate were inspected. Under the condition that 1-butyl-3-methyl tetra-fluorine borates/oil ratio 1:1, reaction time for 30min, reaction temperature for 35℃, multilevel extraction for 6 times after pretreatment, the gasoline extraction was better than that of two other organic extraction agent. The multistage extraction desulphurization rate reaches as high as 95%. Meanwhile experimental results reveal that repeated desulfurization rate of ionic liquid extraction agent has no significant decline after regeneration, so ionic liquids are very good stable extraction agent.