Study On Preparation,characterization And Adsorption Performance Of Sulfur Transfer Agent In FCC Regeneration Flue Gas Unit

With the continuous deepening of the concept of the socialist scientific development concept with Chinese characteristics,strengthening ecological construction and environmental protection and promoting green development have become the focus of people's attention.In the petroleum smelting industry,increasing heavy feedstocks will lead to an increase in coke and impurities that accumulate on the catalyst during the catalytic cracking?FCC?process.More than 50%of the sulfur in crude oil can be converted into hydrogen sulfide,which is then discharged into the atmosphere with FCC regenerated flue gas,causing certain pollution.This puts restrictions and higher requirements on sulfide emissions in the FCC process.At present,the methods that can effectively control the emission of sulfides include raw material hydrodesulfurization and flue gas washing technology,but the cost is relatively high,so the cheap sulfur transfer agent technology needs to be rapidly developed and put into use.However,the breakthrough of catalytic cracking sulfur transfer agent technology is a complex and challenging task.The research on the adsorption mechanism of the nano-scale sulfur transfer agent on the microscopic crystal plane is few and exploratory.Based on this,the subject intends to conduct basic research on the microscopic adsorption kinetics and mechanism of sulfur oxides on the sulfur-transfer active site crystal plane,and analyze the adsorption sites,adsorption microstructures,and energy structures of gas sulfur oxides on different metal active sites Nature,to further deepen the understanding and understanding of the internal structure of sulfur transfer agent and the relationship between desulfurization performance.This topic explored the effects of different preparation methods and the addition of different active components Fe,Cu and Mn on the desulfurization performance of sulfur transfer agents.X-ray diffraction,ultra-high resolution field emission scanning electron microscope,specific surface area and pore size adsorption,infrared spectrum analysis and thermal analysis were used to investigate the structure and performance differences of sulfur transfer agents.The experimental data and results are fitted to obtain the corresponding dynamic equation model.The research idea of sulfur transfer agent is creatively expanded,and it provides a reliable theoretical basis for the further development of sulfur transfer agent.It has important scientific significance and application value.The specific experimental results are as follows:?1?The combination of the microwave co-precipitation method and the glucose soft template method can prepare a sulfur transfer agent with a large specific surface area and a large pore size and a small pore size,which greatly improves the sulfur removal effect of the sulfur transfer agent;?2?Compared with Cu²⁺,Fe³⁺can effectively promote the conversion of sulfur transfer agent during the entire cycle of sulfur transfer agent desulfurization?including two stages of oxidative sulfur absorption and reduction desulfurization?,and the promotion effect of the reduction phase is particularly outstanding;?3?Taking the manganese-containing active component sulfur transfer agent as the research object,the pseudo-second-order dynamic equation was used to verify the fit of the adsorption kinetics,and the quasi-second-order kinetic equation dq_t/dt=0.0072?30.21-q_t?²was obtained.