Characteristics and Stability of Neat and Blended Hydroprocessed Renewable Diesel

In this study, the physical properties and chemical composition of hydroprocessed renewable diesel derived from algae (HRD-76) were measured. Analysis of HRD-76 showed that the main components are C-15-C-18 n-alkanes and branched monomethyl hexadecanes and heptadecanes. Approximately 50% of HRD-76 is n- and iso-C-17. Long-term (ASTM D4625) and accelerated (ASTM D5304) tests were conducted to investigate the storage stability of HRD-76, F-76, and their blends and the effects of long-term storage on the fuel properties. In addition, the ASTM D2274 method was used to test the oxidation stabilities of the neat and blended fuels. HRD-76 has better storage and oxidation stabilities than F-76, and the post-test changes in the fuel properties are influenced by the F-76 fraction in the fuel blend. Extended ASTM D2274 tests were also conducted to investigate the influence of long-term oxidation on the physicochemical properties of the fuel.