Abstract
Diesel fuel mixtures with high concentrations of biodiesel have been investigated to analyze the technical feasibility of their use in diesel cycle engines regarding thermal and oxidative properties. The results of combined techniques of oxidative stability, high Pressurized Differential Scanning Calorimetry (P-DSC), Calculated Cetane Index (CCI), and calorific power were used to verify the effect of the thermal-oxidative stability as a function of the percentage of biodiesel in the mixtures. The obtained results evidenced that the thermal and oxidative stability decreased with the addition of biodiesel from 50 to 5% v/v. Low stability fuels require rapid use as the oxidation compounds degrade the product and impair vehicle performance, as well as lead to corrosion and clogging problems in various mechanical systems.
Highlights
Biodiesel/Petrodiesel blends were prepared at volumetric concentrations of 5, 10, 15, 20, 30, and 50% vol The samples were signed as BX, where “X” represents the volume of biodiesel
To calculate the Calculated Cetane Index (CCI), the BX blends were submitted to atmospheric distillation and specific mass tests, and Equation (1) was applied for the calculations
Similar to the results presented for Rancimat, for the results obtained using the Pressurized Differential Scanning Calorimetry (P-Differential Scanning Calorimetry (DSC))
Summary
In Brazil, road diesel is the most widely used petroleum-derived fuel, and its annual consumption can be correlated with the economic situation of the period analyzed since the transportation matrix of products produced in the country is based on the road network. This petroleum derivative is defined as a liquid fuel composed of hydrocarbons with 8 to 16 carbon chains and, to a lesser extent, nitrogen, sulfur, and oxygen [1]. It is mainly used in diesel cycle engines (internal combustion and compression ignition) in the road, rail, and marine vehicles, and electric power generators
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