In the low temperature, the n-alkane crystal in diesel will crystallize. The smaller grain size of n-alkane crystal, the better low temperature flow properties of diesel fuel will be kept. A large number of studies have shown that some of the low molecular weight polymer can improve the cold flow properties of diesel, such as Ethylene/vinyl acetate copolymer. But we still can't explain clearly the interaction between the polymer and the n-alkanes. We also don't know how to keep the grain size of n-alkane crystal as small as possible.
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