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Using an FS chemical refining agent can improve the stored stability of RFCC diesel. After being stored for 3 months, colority of refined diesel was 3.0, oxidized total insolubles was 1.9 mg/100 mL, acidity was only 1.6 mg KOH/100 mL, and mercaptan sulfur content was obviously decreasing. The aforementioned data met the criteria of GB252-2000. Yield of diesel has reached 99.8%. Processing cost was just ¥25/t, which fits conditions in China.

Catalytic cracking diesel is chemically refined with FS chemical refining reagent and FS01 complexing-trapped reagent, which are developed by ourselves, to improve the oxidation stability of diesel. The results show that the colority of diesel is decreased, and 54.2% of the basic nitrogen and 79.3% of the existent gum are removed, meantime, the quantity of the insoluble matters content after oxidation is reduced to 0.2 mg/100 mL. The yield of the refined diesel is high, which can reach above 99.8%. After refined, the storage stability of diesel is improved greatly and still meets the requirements of national standard of China GB252-2000. This refining process is simple and low in investment and operation cost, so its applied prospect is extensive.

In this article, the structure characteristics of Liaoshu paving asphalts have been studied by the methods of element analysis, SARA and E-D-M. At same time, the relation between composition and structure and using performance of Liaoshu paving asphalt were established. The experimental results show that carbon and hydrogen contents were more than 95%, the hydrogen/carbon atom ratio was about 1.5 in the Liaoshu paving asphalts. The content of saturates is between 20 and 25% in the Liaoshu paving asphalt, aromatics 35 and 40%, resin 25 and 30%, and asphaltene 8 and 10%. There are 45 carbon atoms in the average asphalt molecule, which contain 16–17 aromatic carbon atoms. The number of total ring in the average asphalt molecule is 5–6, the aromatic ring is 3–4, and the naphthene ring is 1–2.