Research On Biological Aviation Kerosene Preparation Technology And Its Social And Economic Analysis

In the field of aviation fuel,many countries and regions in the world have conducted research,production and application trials of different types of bio aviation fuel and made great progress,but there are still some key technical issues that have not yet been solved,especially in high-precision measurement technology,production process control,improving the efficiency of bio aviation fuel production,reducing production costs and other aspects need to be further improved.It can be seen that in-depth research on renewable and environmentally friendly bio-aviation fuel is a top priority.The experiments selected three different oil and grease feedstocks,namely,chitosan oil,palm oil and waste gutter oil,and the catalytic performance of the oil and grease feedstocks was investigated under the same conditions of reaction temperature,hydrogen pressure,time and oil-dose ratio using a modified Pt/SAPO-11 catalyst with more outstanding properties in previous studies in a combined catalytic evaluation device after the reaction in an autoclave.After the evaluation of the physicochemical properties and the catalytic analysis,it was concluded that the petitgrain oil had a better catalytic yield.MCM-22 was selected as the molecular sieve,because of its weak acidity,while two heteropolyacids,phosphotungstic（HPW）and phosphomolybdic（HPMo）,can be modified to target the acidic active sites essential for the catalytic reaction and thus enhance it,while co-loading with the active metals in the molecular sieve plays a synergistic role in the catalytic reaction.Two catalysts,Pt/HPW-MCM-22 and Pt/HPMo-MCM-22,were prepared and further investigated in single-factor experiments to determine the optimum process parameters for the catalytic reactions in autoclaves,and the following data were obtained:the optimum reaction parameters for the Pt/HPMo-MCM-22 catalyst were 260°C,3MPa hydrogen pressure,4h reaction time and 4h reaction oil pressure.The optimum reaction parameters for the Pt/HPMo-MCM-22 catalyst were 260°C,3MPa hydrogen pressure,4h reaction time and 2:1 oil to agent ratio;the optimum reaction parameters for the Pt/HPW-MCM-22catalyst were 260°C,3MPa hydrogen pressure,4h reaction time and 3:1 oil to agent ratio.The analysis of the single-factor experiments showed that the Pt/HPMo-MCM-22 catalyst had better catalytic performance than the Pt/HPW-MCM-22 catalyst in all evaluation indexes.On this basis,the physical and chemical properties of the two modified catalysts were analysed by various characterisation methods such as XRD,TEM,XRF,CO-TPD,NH₃-TPD and Py-IR,and the structural changes of the modified catalysts were investigated to explore the improvement of the catalytic performance of the modified catalysts.It was found that the Pt/HPMo-MCM-22 modified catalysts could play a better catalytic role because the active metal improved the catalytic activity and overall catalyst stability,while the combination of metal and heteropolyacid in the modified catalysts made the catalysts more acidic and had a better synergistic effect on the isomeric effect of the catalytic reaction,improving the yield of the target alkane components without damaging the The catalyst structure was not compromised.Finally,a one-step hydrogenation system for the production of biofuel from small tungsten seed oil at a production scale of 10,000 tonnes/year was designed and accounted for on the basis of the optimum process parameters,and an economic analysis was carried out.The total cost of producing each tonne of biofuel is RMB11,502.20,while the average cost of consuming oil and grease feedstock is RMB8,140.44,accounting for 70.69%of the total cost;the study found that when the cost of oil and grease feedstock is RMB6,672.50 per tonne,the static payback period（P_t）of the system is only 9.82 years,and the dynamic payback period（P_T）is 13.66years,which are less than the benchmark payback period in the same industry.The internal rate of return（IRR）is 16.36%and the cumulative net present value（NPV）and net present value（NPV）are much higher than zero,both of which are higher than the industry level and have better profitability and economics.This study provides a reference value for the joint role of bio-airline paraffin production from the experimental perspective and the socio-economic benefit perspective,with a view to promoting the development of bio-airline paraffin preparation process and economic analysis research to provide an important basis.