SIMULATION EXPERIMENTS ON COKE FORMATION OF HEAVY SLURRY FRACTION IN RFCC DISENGAGER

Effects of reaction conditions and properties of slurry on the coke formation in the thermal conversion process of slurry were studied by a self-designed thermal reaction experiment apparatus and TG analysis.The experimental results showed that the properties of slurry,such as the atomic ratio of n(H)/n(C),carbon residue(CR) and structure group composition,affected the coke formation more greatly than the reaction conditions,such as reaction time,reaction temperature and catalyst content in slurry.The boiling point of heavy slurry fraction does not determine effectively the coke formation tendency in resid fluid catalytic cracking(RFCC) disengager,while resin and asphaltene in slurry are the main precursors of coke,in which the ratio of aromatic carbon has a good linear relationship with the coke formation.Optimizing reaction condition in RFCC disengager can relieve the coke formation in some extent,but the key to prevent the coking in disengager is to reduce the content of precursor in slurry by adjusting the operating condition of the riser.