The Techology Research On Synthesized Gasoline Of Highly Octane Number Components Via Low Carbon Olefin And Formaldehyde

Gasoline was mainly used for gasoline engine fuel,such as cars,motorcycles,speed boats,helicopters,agriculture and forestry aircraft.Engine performance and exhaust emission were greatly infuenced by gasoline quality.Olefins were widely used as an ideal component to reconcile high-octane gasoline.However,the study found that the high olefin content in gasoline could easily vulnerable to colloid and carbon deposit formed in the engine,affecting the drive of the engine and increasing the fuel consumption.At the same time,the nitrogen oxides?NO_x?and the unburned olefins were also increased in the exhaust emission.Under UV irradiation,the formed of ozone,aldehydes and acetyl nitrate ester peroxide from nitrogen oxides and some unburned hydrocarbons was caused photochemical pollution,seriously iMpact on human health and the growth of crops.So the production of high octane number gasoline of low olefin content was an urgent problem to be solved in our country at present.In this project,the model of the Prins condensation reaction from 1-hexene and formaldehyde was studied,a new additive of gasoline with oxygen fule was synthesized in slurry reactor.The reaction products were characterized by gas chromatography,mass spectrometry and nuclear magnetic resonance spectroscopy.According to the structure and distribution of the reaction products,the reaction mechanism of Prins condensation reaction from 1-hexene with formaldehyde was proposed.The product of 4-butyl-1,3-dioxane was separated and purified by silica gel column chromatography with petroleum ether-ethyl acetate?50:1,v:v?as eluant.The purity of 4-butyl-1,3-dioxane determined by gas chromatography was 94.37%.The optimal processing conditions of the Prins condensation reaction of 1-hexene with formaldehyde were investigated by single factor experiments.The experimental results show that the optimum reaction conditions were as follows,the molar ratio of 1-hexene and trioxymethylene was 3:1,the reaction temperature was 105?,the reaction pressure was 1.5Mpa,the stirring speed was 300r·min^-1 and the catalyst concentration was 3%and the reaction time was 3h.In this condition,the formaldehyde were reacted completely,to avoid the problem of separation of formaldehyde.and the 1-hexene conversion rate could achieve 36.81%.According to the model system of Prins condensation reaction from 1-hexene and formaldehyde were stuied,the explore and analyze of FCC gasoline actual system were established.The reaction with FCC gasoline-formaldehyde?3:1,m:m?was carried out under the optimal process conditions.The result show that the formaldehyde were reacted completely,and the olefin content in FCC gasoline was reduced by 8%.The properties of oxygen containing compounds like boiling point,condensation pointdensity,density,viscosity,Corrosion grade of copper,distillation range,RON,and a series of physical and chemical indicators of diesel were measured.In this paper,the thermodynamic and kinetic of the 4-butyl-1,3-dioxane synthesis reaction were also studied at 363.15K³83.15K with the 1-hexene and trioxymethylene material and DFHS-5 acidic cation exchange resin catalyst.In case that the internal diffusion and external diffusion on the reaction were eliminated,a reasonable hypothesis was put forward according to the actual reaction system.The overall reaction model was applied to correlate the experimental data.The results showed that the reaction order of 1-hexene was0.56,the reaction order of formaldehyde was 1.08,the activation energy was 79.4032 kJ·mol,and Arrhenius constants was 3.32×10⁸min^-1.The thermodynamic parameters of each substance were simulated by Chemoffice software.Desigeing and calculateing the reaction process.The reaction system was as exothermic reaction in 90-110?,and the adiabatic temperature rise is 25?.