加氢轻循环油裂化反应规律研究

以加氢轻循环油（LCO）为原料，采用含Y型分子筛、活性中孔材料以及含β或MFI结构分子筛的不同类型催化剂在小型固定流化床ACE Model Rt装置上进行裂化反应实验，考察不同类型催化剂对加氢LCO中各组分的转化能力，并考察反应条件对加氢LCO裂化反应的影响。结果表明：采用含高活性Y型分子筛的催化剂能够得到较高的汽油收率及C6～C9芳烃收率，有利于提高汽油辛烷值或者获得较多的苯、甲苯、二甲苯等化工产品，但反应过程同时会生成双环及多环芳烃，抵消了部分加氢前处理的效果；反应温度和剂油比对加氢LCO裂化转化率影响较小；汽油收率随反应温度的提高而降低，剂油比对汽油收率的影响较小；提高反应温度会促进重质产物的生成，而提高剂油比则会抑制重质产物的生成；反应温度和剂油比的提高均有利于增加汽油中芳烃含量。

STUDY ON CATALYTIC CRACKING OF HYDROTREATED LCO

The catalytic cracking experiments of hydrotreated LCO (HLCO) were conducted in an ACE unit for Y zeolite, active meso-pore material and zeolites withβor MFI structure. The conversions of the components in the feed and the influence of conditions on the cracking reaction were investigated. The results show that the higher gasoline and C6-C9 aromatics yields are obtained by catalysts containing Y type zeolite with higher gasoline octane, but aromatics with double ring and multi-ring are generated simultaneously during the reaction process, which offset part of the benefit of hydrotreating process. The reaction temperature and catalyst to oil ratio has less influence on the HLCO conversion; the increase of reaction temperature has negative impact on gasoline yield, while catalyst to oil ratio has weak influence on it. The high reaction temperature promotes the generation of heavy product, but high catalyst to oil ratio is just opposite. The increase of both reaction temperature and catalyst to oil ratio raise the aromatics content of gasoline.