Abstract
Precipitation of n-alkanes in diesel fuel affects their cold-fluidity properties. Diesel fluidity improvers (DFIs) decrease the cold filter plugging point (CFPP) of diesel fuels by interacting with n-alkane crystals. The relationship between fuel response to DFI treatment and some factors such as n-alkane contents and distributions was investigated. The effects of DFIs are excellent when they is used in those diesel fuels with moderate n-alkane contents. The melting point of the most efficient DFI for a diesel is similar to that of the n-alkane, which has about two carbons longer than the average carbon number in this diesel. From the X-ray diffraction (XRD) spectra, we can find that effective DFIs have the same crystal plane as n-alkane crystals in diesels and improve wax crystallinity. From above results, we deduce that the function of DFIs is that they influence flow by nucleation and adsorption and modify the growth habit of the waxes.
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