engleski

Thermal properties of diesel with different methyl and benzyl methacrylate polymer additives

A major disadvantage of diesel fuel compared to gasoline is the affinity of higher n-paraffins to precipitate at lower ambient temperatures and form paraffin wax crystals that tend to agglomerate and affect the applicability of diesel in winter. This has been further emphasized in recent decades by stricter diesel fuel composition regulations to reduce exhaust emissions. The result is a greatly reduced content of aromatics, olefins, and sulphur compounds in diesel. With the reduced content of aromatics, the n-paraffins in the fuel become less soluble so the diesel fuel has poorer low temperature properties. Typical approaches to these problems include kerosene blending, undercutting and catalytic isomerization, but the most common is the addition of additives to improve low- temperature properties. [1, 2] In our research, we synthesized various polymer additives based on methyl and benzyl methacrylate and studied their influence on the thermal properties of their formulations with diesel. We measured the crystallization temperature of the formulations using differential scanning calorimetry (DSC) and observed the crystal morphology of the wax crystals at different temperatures using an optical microscope with polarization and a cooling stage. Standard tests of low-temperature properties were performed according to EN 116 for the Cold Filter Plugging Point (CFPP) and ASTM D 5950 for Pour Point (PP). The results showed that the additives lower the crystallization temperature of diesel formulations and change the shape and the size of the wax crystals from larger needle like to small spherical crystals.

Diesel ; Polymer additives ; Thermal properties

nije evidentirano