小晶粒Y型分子筛催化剂的加氢裂化反应性能

采用小晶粒Y型分子筛制备加氢裂化催化剂，在一段串联小型固定床加氢裂化装置上考察了小晶粒催化剂的重油裂化性能，以及反应温度、空速、精制段出口氮含量对催化剂裂化性能的影响，并进行了催化剂的稳定性试验。结果表明：相同条件下，采用小晶粒催化剂比采用常规催化剂能够使原料油的转化率提高3.5百分点；升高反应温度能够提高原料油的转化率，在保持转化率不变的条件下，空速对产物分布和性质的影响不大；精制段出口氮含量的提高会降低产物的收率和质量；在360 h到2 160 h的反应稳定性考察试验中，反应温度仅提高2 ℃，产物分布变化不大，表明小晶粒催化剂具有良好的稳定性。

HYDROCRACKING PERFORMANCE OF SMALL CRYSTAL SIZE ZEOLITE Y CATALYST

Hydrocracking catalyst containing small crystal size zeolite Y was prepared and its hydrocracking performance processing heavy oil was studied using a single stage device with two fixed-bed reactors in series.The effects of reaction temperature,liquid hourly space velocity(LHSV) and nitrogen content of hydrotreated feed on the cracking performance of catalyst were investigated,as well as the stability of catalyst was examined.Results showed that under the same reaction conditions,compared with conventional zeolite Y catalyst,using small crystal size zeolite catalyst the conversion of feed could be higher 3.5 percentage points.Results also showed that with the increase of reaction temperature,the conversion of feed increased;under constant conversion,the effect of LHSV on product distribution and product quality was little;the increase of nitrogen content in hydrotreated feed had negative effect on product yield and quality.During the long-term stability test,from 360 h to 2 160 h,the reaction temperature only increased 2 ℃,and the distributions of products basically unchanged,which indicated that the operation stability of small crystal size zeolite Y catalyst was excellent.