Study On The Reaction Of Selective Hydrogenation Of Rich Fragrant Inferior Oil To Produce High-quality Jet Fuel

As an important processing method for the lightening of heavy oil,the catalytic cracking process often mixes atmospheric residue(AR)and vacuum residue(VR)into the heavy oil for reaction,which leads to an increasing trend in the content of polycyclic aromatic hydrocarbons in the heavy oil.In order to increase the conversion rate of heavy oil and the yield of light oil,the traditional catalytic cracking process returns the heavy distillate oil with a temperature of350?500?after the catalytic cracking reaction of the feedstock to the unit to continue cracking.This part of the distillate that continues to be cracked is the FCC heavy oil.According to the different heavy oil used in catalytic cracking,the property of FCC recycle oil is different,but in general,it is rich in aromatic components,and the total aromatic content is as high as 81.0%.Among them,the content of polycyclic aromatic hydrocarbons above bicyclic is 75.4%.Hydrogen cracking has low light oil yield and large coke production,which not only increases the load of the regenerator,but also reduces the processing capacity of the RFCC unit and the economic benefits of the catalytic cracking unit.In this study,the research object is rich aromatic inferior oil.In the experiment,the FCC refining oil is selected as the raw material,and the goal is to produce high-quality jet fuel.The hydrogenation catalyst was prepared by using magnesium aluminate as the carrier.Firstly,Investigate the influence of different active metals Ni,Mo,W on the distribution of FCC refining hydrogenation reaction products;Secondly,Investigate the influence of P modification and the addition of HY molecular sieve on the hydrogenation performance of the catalyst,as well as the influence of different process conditions on the hydrogenation performance of the catalyst.Finally,naphthalene oil is used as simulate compounds and investigates the effect of catalysts on the hydrogenation reaction products of bicyclic aromatic hydrocarbons under optimal conditions.Optimization and evaluation of hydrogenation catalysts:XRD,XPS,BET,CO₂-TPD and Py-IR characterization methods are applied as the conduct physical and chemical analysis of the catalyst.The hydrogenation catalyst is optimized by four factors:the carrier,loading,active component ratio and auxiliary agent.The results show that the hydrogenation effect of the catalyst prepared with 0.3%P modified magnesium aluminate,20%metal loading,1:3nickel-tungsten ratio,and 30%HY molecular sieve is the best;Optimization and evaluation of the process conditions of the hydrogenation catalyst:The three process conditions of reaction pressure 6?10 MPa,reaction temperature 320?400?,and reaction time 15 min,30 min,45 min,60 min and 75 min have been investigated.The results show that the reaction pressure is 8 MPa,the reaction temperature is 360?,and the reaction time is 45 min,the catalyst exhibits the best hydrogenation performance.Finally,coal tar naphthalene oil fraction was used as a simulation compound to conduct a preliminary study of the aromatic hydrogenation reaction mechanism.