Abstract: Three kinds of catalysts with higher acidity, larger specific surface area and lower content of hydrogenation metals developed by FRIPP were used in pilot-scale hydrocracking unit with FCC diesel with higher aromatics content as feedstock. Under the same process conditions, the effects of the three types of catalysts on the product distribution, liquid yield, hydrogen consumption and product properties were studied. The experimental results showed that under suitable process conditions and using catalysts with enhanced acidity, increased specific surface area and reduced hydrogenation metal content, the yield of heavy naphtha and chemical hydrogen consumption would increase, while the diesel yield and liquid yield would decrease.The anti-knock index of heavy naphtha could reach more than 84, and the increase of cetane index of diesel could reach more than 35. Based on the data, a six-level total kinetic model was established to predict the properties of hydrocracking unit such as liquid yield and hydrogen consumption, alkanes, cycloalkanes, aromatics and anti-knock index of naphtha fractions, and alkanes, cycloalkanes, aromatics and cetane index of diesel fractions. By adjusting the model parameters and comparing the predicted values with the test values, the effects of different catalysts on the properties of FCC diesel hydrocracking products were predicted. The prediction error were all within 4%.

Key words: catalyst, hydrocracking, FCC diesel, product distribution, product quality

摘要： 采用中国石油化工股份有限公司大连(抚顺)石油化工研究院研制的三种酸性依次提高,比表面积依次增大,加氢功能金属含量依次减少的催化剂,以芳烃含量较高的催化裂化柴油为原料进行了中试试验,在工艺条件相同的情况下,研究了上述三种不同类型催化剂对催化裂化柴油加氢裂化的产品分布、液体收率、氢耗和产品性质的影响规律。结果表明:在适宜的工艺条件下,采用酸性增强、比表面积增大和加氢金属含量减少的催化剂,加氢裂化产品中重石脑油收率和化学氢耗增加,柴油收率和液体收率减小,重石脑油抗爆指数可以达到84以上,柴油馏分十六烷指数可以达到35以上。以此数据建立六级总动力学模型,实现了加氢裂化装置液收和氢耗预估,以及石脑油馏分烷烃、环烷烃、芳烃和抗爆指数,柴油馏分烷烃、环烷烃、芳烃和十六烷指数率等产品性质的预测。通过对模型参数的调整,以及预测值与试验值的对比,较好地预测了不同催化剂对催化裂化柴油加氢裂化产品性质的影响,预测误差均在4%以内。

关键词: 催化剂, 加氢裂化, 催化裂化柴油, 产品分布, 产品质量