关键词: 催化裂化, 铁污染, 催化剂

Abstract: Affected by the processing of heavy and poor quality raw oil, the catalyst is seriously polluted by heavy metals. The heavy oil catalytic cracking unit of a domestic refinery has suffered serious iron poisoning. The iron content of the feedstock is higher than 20 μg/g, and the iron content on the Ecat is as high as 15 mg/g. Catalyst iron poisoning not only affects the long-term operation of the unit, but also reduces the conversion rate of heavy oil, deteriorates product distribution, and influence the fluidization of the catalyst. In  order to improve the anti-iron pollution ability of FCC catalysts and alleviate the impact of iron poisoning on the unit, SINOPEC Research Institute of petroleum Processing developed the anti-iron catalyst CMT and carried out commercial application. The commercial application results showed that Compared with the contrast agent, the mass fraction of contaminated iron on the balance agent increased by 2 210 μg/g, the yields of gasoline and diesel increased by 1.76 percentage points and 1.04 percentage points respectively, and the yields of dry gas and coke decreased by 0.42 percentage points and 1.47 percentage points respectively. It shows better resistance to iron poisoning and excellent product selectivity.

Key words: catalytic cracking, iron contamination, catalyst