降低催化裂化汽油加氢反应器压力降的措施

Measures for reducing pressure drop of FCC gasoline hydrotreating reactor

采用OCT-MD技术的催化裂化汽油加氢装置多次因反应器床层压力降问题被迫停工,结焦样品焙烧分析认为积炭大多是二烯烃聚合的产物。加氢反应器压力降增加过快的主要原因是原料油储运过程中的腐蚀产物、二烯烃在存在氧、水和铁锈的条件下会发生聚合反应,在硫化铁的催化作用下进一步快速聚合成有机颗粒沉积在催化剂表面,造成床层堵塞。采用OCT-ME技术对装置进行扩能改造,利用柴油吸收可脱除催化轻汽油(LCN)中的二硫化物。实践证明,采用OCT-ME技术可生产满足国Ⅴ标准要求的汽油。辛烷值不损失、反应器压力降正常,可连续长周期运转。

The FCC gasiline hydrotreating unit of OCT-MD process has to be shutdown several times because of the reactor bed pressure drop problems. The analysis of calcined coke concludes that the carbon deposition is mostly polymerization product of diolefines. The rapid pressure drop increase of hydrotreating reactor is mainly due to the polymerization of diolefines and corrosion produets at the presence of oxygen, water and iron rusts in the process of feedstock storage and transportation. The polymerization products deposited on the surface of catalysts and blocked the reactor bed. When the unit is revamped for expansion with OCT-ME process, and diesel absorption is used to remove the disulfides from light catalytic naphtha （LCN）, Guo V gasoline is produced. There is no octane loss, the reactor pressure drop is normal and the unit is running con- tinuously and stably.