Abstract: The FCC diesel fraction of SINOPEC Changling Company was rich in aromatics and low in cetane number, thus, studies of extracting aromatic hydrocarbons from this diesel fraction with selected solvent to improve its cetane number were carried out. Test results showed that when solvent extractions were carried out under the conditions of extraction temperature in the range of 130—150℃, solvent to oil volume ratio in the range of 1.5—6.0, the aromatic mass fractions of these obtained raffinate oils could be decreased to 38.4—63.3% and their cetane number reached more than 45, the increments were over 20 units as compared with the feed. The aromatic extract from this process was rich in monocylic aromatic, which could be used as aromatic solvent.

Key words: catalytic cracking diesel fraction, aromatic hydrocarbon, solvent extraction , raffinate oil , aromatics mixture