The Catalytic Oxidation Of The Extraction, Removal Of Sulfides In Fcc Gasoline

With the development of industrial technology,The clean fuel already has became the development trendency of fuel oil in each country, At present Hydro-desulfurization can remove the majority of sulfur-containing compounds, but it is difficult to remove many stubborn sulfide, such as benzenethiophene and dibenzenethiophene derivatives, In many developed countries successively developed new desulfurization process for responding to the strict requirement of oil standards of world. Facing to the world fuel strict standards, The deep desulfurization of subject must conquer due to refining technology lagged behind developed countries in China.Recently years a number of alternative technologies incuding adsorption,extraction,biological,alkylation,oxidation desulfurization,The selective catalytic oxidative extraction is one of the most rising deep desulfurization methods, thesis focuses on removing sulfide in FCC gasoline.The following is the experimental process and results:1.The catalyst is first synthesized by Imidazolium-based ionic liquids,Cetyl trimethyl ammonium bromide and Heteropoly acid. Using IR technologies characterized the catalystic structure and TG analyzed the catalystic thermal condition.2. In order to determine the reaction system,catalytic activity and process conditions using in catalytic oxidative removeing of benzothiphene in n-octane.The results of experiments showed that the catalytic activity of quaternary ammonium phosphomolybdate higher than the catalytic activity of quaternary ammonium phosphatotungstate catalyst in the catalytic reaction system that includes catalyst,hydogen peroxide and extractant, the experiments showed that the catalyst[(BMIM)2(CTMA)PMo12O40] with high selectivity and high activity. In this condition:n(Catalyst)/(Sulfur)=0.06,n(Hydrogen peroxide)/n(Sulfur)=6, T(Reaction temperature)=60℃, V(Acetonitrile)=6 mL, t(Reaction time)=60min, the desulfurization rate was up to 69.4%.From the kinetics study, it was shown that the reaction was first order reaction.3.The desulfurization of FCC gasoline of single-factor experimental results showed the same tread, indicated the desulfurization of model gasoline of simulation model is very reliable,the results shows that the catalyst [BMIM]2[CTMA]PMo12O40 have high catalytic activity.4. Based on the single-factor experiments,using the Plackett-Burman design and Box-Behnken design improve the desulfurization rate and optimize the production process, the result showed that Extraction dosage,Reaction temperature,Reaction time are significant factors. Then the optimum conditions were optimized by response surface analysis. the result showed that the optimum conditions are as follows:V(Acetonitrile)=6.1 mL, T(Reaction temperature)= 64.7℃, t(Reaction time)= 89 min, Under the optimal reaction conditions, the theory of optimum desulfurization rate is 86.47%, its experimental value tested 84.7%, indicated that the simulation model is very reliable.In the end, the catalyst reused seven times, the experiment result showed that the catalyst has high catalytic efficiency for the previous third desulfurization, Its average ratio of desulfurization rate can reach up to 75.7%.