Study On Simulated Gasoline Components Of Liquid-liquid Equilibrium About Environmentally Friendly Gasoline Additive,Diisopropyl Ether

In recent years, "PM 2.5" and ―"fog haze" have become a topic which is closely linked with the life of people. APEC blue has become a hot topic of people for the atmospheric pollution. Automobile exhaust is one of the main sources of air pollution. We add additive in gasoline to improve the utilization values of gasoline, and to reduce the exhaust emissions such as NO, NO2, CO. Diisopropyl ether(DIPE) is receiving much attention as a possible gasoline additive in recent years, for its high octane number, good antiknock performance and the advantages of easy biodegradation. In this paper, in order to make a further investigate of whether DIPE could be gasoline additive or not, we analyzed the phase equilibrium behavior with DIPE added into simulation components of gasoline.In this paper, we used a gas chromatograph to study the ternary system(DIPE + water + positive octane), and the quaternary system(water + n-propanol + DIPE + octane),(water + n-propanol + DIPE + methylbenzene) and(water + n-propanol + DIPE + heptane) of the liquid-liquid equilibrium at T = 298.15 K and ambient pressure. The liquid-liquid equilibrium data for each system were calculated by the Modified UNIQUAC model and Extended UNIQUAC model.Compared with the experimental and calculated values, we found that they are well agreement with each other for the ternary and quaternary systems measured. It shows that the Modified UNIQUAC model and Extended UNIQUAC model can accurately correlate the ternary and quaternary liquid-liquid equilibrium data. It also indicates that as a kind of ether gasoline additive, DIPE can well dissolve in the simulated gasoline with n-propanol, octane, methylbenzene and heptane. DIPE can obviously reduce the solubility of hydrocarbons in water and reduce gas pollution in the water ground environment. So, DIPE is fit for gasoline additive.