Abstract: The wide and narrow fractions of FCC slurry from Shandong Chambroad Petrochemical Co., Ltd. were cut by a 6 L real boiling point distillation unit. It was found that the sulfur and nitrogen content was increased with the increase of fraction yield, while the aromatic content was increased firstly and then decreased. When the fraction yield was 60%, the content of aromatic was the highest. In the cutting of every 10% narrow fraction, with the fraction becoming heavier, the content of tricyclic aromatics was decreased, the content of tetracyclic aromatics was increased at first and then decreased, and the content of tetracyclic aromatics were obviously decreased after 50%-60% narrow fraction. The optimum fraction to meet the demand of acicular coke was from the initial fraction to 60%.

Key words: catalytic cracking, oil slurry, composition analysis, needle coke