关键词: 流化催化裂化, 油浆, 针状焦, 环保橡胶填充油

Abstract:

The yield of slurry oil from FCC unit is usually more than 5%. It is necessary to eliminate solid particles from them for integrated utilization. The decant oil can be directly mixed into the feedstock of some heavy oil processes including delayed coking, solvent deasphalting, asphalt blending, hydrocracking and so on. But the added value of them is low. The current researches about the decant oil focus on component separation through the processes including vacuum distillation, solvent extraction, supercritical fluid extraction and so on. The high-value components from the processes, especially intermediate aromatic component, can be deeply processed into needle coke, environmental friendly rubber filling oil, asphalt resin, carbon fiber and so on. Supercritical fluid extraction can separate the slurry oil at a lower temperature so as to avoid mass destruction of component by distillation with high temperature. Therefore, supercritical fluid extraction is becoming the host research field for producing needle coke. The process of delayed coking is usually used to produce needle coke. Low speed, low temperature and long residence time are required in the early stage of reaction. But it is necessary to raise temperature at later stage for engendering traction on needle coke by masses of airflow which is produced in the reaction. There is still a big gap in product quality between China and foreign countries. The PCA and eight kinds of PAHs of environmental friendly rubber filling oil from slurry oil need to be reduced to 3% and 10mg/kg. Meanwhile, the C_A must be maintained above 10% in order to sustain the compatibility with the body of rubber. This contradiction can be solved by screening or compounding extractants.

Key words: fluid catalytic cracking (FCC), slurry oil, needle coke, environmental friendly rubber filling oil