为了解决催化柴油进第二提升管多产汽油工艺中因加氢催化柴油(HLCO)循环量较大而产生的产品分布恶化等问题,提出了催化柴油芳烃抽提与催化裂化组合工艺。该工艺采用加氢精制-轻重分离-芳烃抽提-催化裂化组合工艺加工催化柴油,分离出难以裂化的多环芳烃组分进行单独利用,第二提升管加工HLCO中的易裂化组分,解决了HLCO中多环芳烃在催化裂化反应中难以裂化的问题,压减柴油、增产高附加值产品效益显著。

In order to solve the problem that the product distribution deteriorates due to a large circulating amount of hydrogenated light cycle oil (HLCO) in the process of HLCO entering the secondary riser to increase gasoline yield,a process combining light cycle oil (LCO) solvent extraction with fluid catalytic cracking is proposed.This combining process adopts hydrotreating,fractionating,aromatics extraction,and fluid catalytic cracking to handle with LCO.The bicyclic and tricyclic aromatics,which are difficult to crack,are extracted separately from the heavy fractions of HLCO.The other components prone to cracking are processed by the secondary riser,which solves the problem that polycyclic aromatic components in HLCO are difficult to crack in fluid catalytic cracking reaction.This process has significant benefits in reducing diesel oil yield and increasing the yield of high value-added products.