Study On Ozone Oxidate FCC Diesel Desulfurization Process

As the world’s oil consumption increases year by year,crude oil is heavy and high sulfurization is becoming more and more serious.The generation of SO_X after the combustion of sulfides in high-sulfur crude oil not only forms a series of serious ecological problems such as acid rain damage to the environment and pollution of water bodies,but also endangers human health.Therefore,countries around the world have enacted more stringent laws and regulations to control the sulfur content in oil products.The development and use of low-sulfur and ultra-low-sulfur fuel oils has become an international development trend.At present,hydrodesulfurization（HDS）is already a very mature industrial desulfurization method.However,HDS technology usually requires high temperature and high pressure operating conditions to convert organic sulfur compounds into H₂S.However,due to the steric hindrance effect of fused ring thiophene sulfides,HDS technology does not remove high efficiency.The oxidative desulfurization technology is carried out under mild non-hydrogen conditions,and the organic sulfide is oxidized to a relatively polar substance,and separated by an extraction method,the process flow is simple,the operation cost is low,the desulfurization rate is high,and the oil can be removed.More than 80%of thiophene sulfur-containing compounds have good industrial application prospects and have received extensive attention.In this paper,the sulphide in simulated oil and catalytic cracked diesel oil was oxidized by extraction and oxidation combined desulfurization process,and the effect of reaction conditions on desulfurization effect was investigated.（1）A sulphur content of 2100μg/g simulated oil was prepared using thiophene（TH）,benzothiophene（BT）and dibenzothiophene（DBT）as model sulfides.Ozone（O₃）was used as the oxidant and methanol was used as the extractant.The oxidative removal of the sulfide in the oil was investigated.Morphological analysis of sulfur was performed using GC-SCD.Under the optimum reaction conditions of ozone flow rate of 0.20 L/min,reaction temperature of 35℃,reaction time of 70min and ratio of solvent to oil of 1:1,the TH removal rate of the oxidative desulfurization system was 43.4%,and the BT removal rate was 92.8%.The DBT removal rate was 99.6%.（2）The catalytic cracking diesel oil of PetroChina Fushun Petrochemical Company No.2 Refinery is used as raw material oil,Ozone（O₃）is used as oxidant,methanol is used as extractant,and sulfur-containing compounds in raw oil are removed by oxidation-extraction method,and FT-IR and GC-SCD are adopted.Characterize it.In the optimum reaction conditions in this experiment:the reaction temperature is 50℃,the ozone flow rate is 0.20 L/min,the reaction time is 50 min,and the ratio of the agent to oil is 1:1.The desulfurization rate in the oxidative desulfurization reaction system can reach 90.2%.In addition,the physicochemical properties of the refined diesel oil after oxidative extraction have not changed.（3）The catalytic cracking diesel oil of PetroChina Fushun Petrochemical Company No.2 Refinery is used as raw material oil,Ozone（O₃）and hydrogen peroxide（H₂O₂）are used as oxidants,methanol is used as extractant,and O₃/H₂O₂ synergistic oxidation-extraction combination is used to remove sulfur compounds in feedstock oil.The oxidative desulfurization performance was studied.The characterization of the feedstock oil and refined diesel oil was carried out by means of FT-IR and GC-SCD.The oxidation products were analyzed by GC-MS.The results show that the experimental results show that the amount of catalytic cracking diesel in Fushun No.2 Oil Plant,the amount of hydrogen peroxide added of 2%,the reaction temperature is 50℃,the Ozone flow rate is 0.10 L/min,the reaction time is50 min and the oil is under the optimal reaction conditions of 1:1,the desulfurization rate of the oxidative desulfurization reaction system can reach90.8%.