LCO加氢处理生产催化裂化原料的加氢深度研究

研究LTAG技术中LCO加氢深度对催化裂化反应的影响,结果表明,LCO加氢深度对催化裂化反应的影响明显,适当控制LCO加氢深度,尽可能将LCO中的多环芳烃加氢转化为单环芳烃,可使催化裂化得到高收率的高辛烷值汽油。中试实验结果表明,采用NiMoW/Al_2O_3催化剂对LCO进行加氢处理,可以在多环芳烃饱和率达80%以上的同时保持较高的单环芳烃选择性。工业应用结果表明:以多环芳烃质量分数为68.7%~69.3%的LCO为原料进行加氢处理,多环芳烃饱和率达81.5%~81.8%,单环芳烃选择性达81.0%~82.3%,实现了高多环芳烃饱和率下的高单环芳烃选择性;以此加氢LCO作为催化裂化进料,催化裂化汽油的收率提高10百分点,汽油辛烷值RON提高1个单位。

INVESTAGATION ON HYDROGENATION DEPTH OF LCO HYDROTREATING FOR PRODUCING FCC FEED

The depth of LCO hydrogenation has a significant effect on the FCC results. In order to obtain high octane gasoline with high yield, the LCO hydrogenation depth is needed to be controlled appropriately to convert polycyclic aromatic hydrocarbons to corresponding monocyclic ones. Pilot plant test results showed that when the saturation rate of polycyclic aromatic hydrocarbons is over 80% the high selectivity of monocyclic aromatic hydrocarbons over NiMoW/Al2O3 catalyst can still be maintained. The commercial results indicated that the saturation rate of polycyclic aromatic hydrocarbons reaches to 81.5%～81.8% with the selectivity of monocyclic aromatic hydrocarbons of 81.0%～82.3% using LCO with polycyclic aromatic hydrocarbons 68.7%～69.3% as hydrotreating feed. The yield of FCC gasoline increases by 10 percentage points with the RON rising by 1 unit.