加氢LCO催化裂化生产轻质芳烃的关键组分研究

STUDY ON KEY COMPONENTS OF HYDROGENATED LCO CATALYTICCRACKING FOR LIGHT AROMATICS PRODUCTION

采用小型固定流化床(FFB)试验装置,在适宜的工艺条件下对比不同烃组成的加氢催化裂化轻循环油(LCO)催化裂化生产轻质芳烃的潜力,确定了加氢LCO中生产轻质芳烃的关键组分为环烷烃和非茚类单环芳烃,且加氢LCO中环烷烃含量与其贡献的轻质芳烃产率和选择性成正比,非茚类单环芳烃贡献的轻质芳烃选择性与非茚类单环芳烃含量呈良好线性关系,进而计算得出在有效的关键组分质量分数区间(30%~70%)内,加氢LCO中相同含量的非茚类单环芳烃对轻质芳烃选择性的贡献约为环烷烃的2倍。

A small-scale fixed fluidized bed(FFB)pilot plant was used to compare the potential of light circulating oil(LCO)catalytic cracking for producing light aromatics under the conditions suitable for LCO hydrogenation,the key components of FCC light aromatics in hydrogenation of LCO were identified as cycloalkanes and non-indenylated monocyclic aromatics.Based on the result that the mass fraction of cycloalkanes in hydrogenated LCO was positively proportional to its contribution to light aromatics yield and selectivity,a good linear relationship between the light aromatics selectivity contributed by non-indene monocyclic aromatic hydrocarbons and the mass fraction of that was obtained,and it was calculated that the non-indene monocyclic aromatic hydrocarbons in hydrotreated LCO contributed to the light aromatics selectivity about twice as much as that of cycloalkanes for the same mass fraction in an effective mass fraction interval of the key components(30%-70%).