Characterization of diesel containing sulfur by thermogravimetry (TG) and simulated distillation (SIMDIS)

摘要

One of the main problems related to the use of diesel as fuel is the presence of sulfur (S) which causes environmental pollution and corrosion of engines. In order to minimize the consequences of the liberation of this pollutant, Brazilian law established maximum sulfur content that diesel fuel may have. To meet the requirements, the diesel oil with low sulfur content has been widely marketed in the country. However, the reduction of sulfur can lead to changes in the physicochemical properties of the fuel, which are essential to the performance of road vehicles. This work aims to identify the main changes in the physicochemical properties of diesel fuel and how they are related to reduction of sulfur content. Samples of diesel types S10, S500 and S1800 were analyzed. The physicochemical properties such as density, flash point, kinematic viscosity and low temperature properties were determined. The samples of diesel containing sulfur were well characterized by thermogravimetry (TG) and distillation (D86) and simulated distillation by gas chromatography (D2887). The results showed that the reduction of sulfur became lighter and fluid fuel, allowing a greater applicability to low temperature environments and safer for transportation and storage. Through the simulated distillation data was observed that decreasing sulfur content resulted in higher initial boiling points temperatures and the lowering of the boiling temperature of the medium and heavy fractions. Thermogravimetric analysis shows a loss event mass attributed to volatilization or distillation of light and medium hydrocarbons. The TG analysis showed an event of mass loss, attributed to volatilization or distillation of light and medium hydrocarbons for all oils. However the volatilization profiles were different for each type of sample. It was observed that as the sulfur concentration of diesel decreased, the maximum temperature of weight loss ??also decreased. Evaluating the results of thermogravimetric analysis together with the distillation data, it was verified that up to about 90% of distillate, the mass loss behavior is correlated using both methods.