FCC汽油加氢多功能催化剂的评价及工艺优化

Evaluation and Process Optimization of FCC Gasoline Hydrogenation Multifunctional Catalyst

针对FCC汽油加氢改质技术要求,制备得到了多功能催化剂。针对硫含量<100μg/g的FCC汽油原料,生产硫含量<10μg/g的加氢产品,其辛烷值损失<0.7单位。相对于原料,其加氢产品烯烃降量5v%~8v%,芳烃增量1v%~3v%,异构烃增量2v%~3v%,说明该催化剂在加氢脱硫的同时,达到了烯烃定向转化,保持了辛烷值损失较小的目的。该催化剂在具有加氢脱硫和辛烷值恢复功能的同时,还具有抑制H_2S反生成硫醇活性,因此可以减少现有部分选择性加氢脱硫工艺需要添加抑制硫醇生成的反应器,降低了装置的投资。从加氢产品的各项指标综合考察,催化剂的最优评价工艺参数为:反应温度320℃以上,反应压力2.0~2.5 MPa,氢油比200~300,催化剂装填的体积空速1.5~2.0h-1。

The multifunctional catalyst was prepared for the technical requirements of FCC gasoline hydrogenation upgrading. For FCC gasoline ingredient with sulfur content less than 100 μg/g, the hydrogenation products with sulfur content less than 10 μg/g are produced, and its octane value loss is less than 0.7 units. Compared with the ingredient, the olefin decrement, arene increment and isohydrocarbon increment of the hydrogenation products are 5 v%-8 v%, 1 v%-3 v% and 2 v%-3 v%, respectively. The above results show that the catalyst can achieve the oriented conversion of olefin and reduce the octane value loss at the same time of hydrodesulfurization. The catalyst not only has the function of hydrodesulfurization and octane value recovery, but also can inhibit the regenerated mercaptan activity of H 2S. Therefore, it can reduce the existing selective hydrodesulfurization process which needs to add the reactors to inhibit the mercaptan generation, and reduces the device investment. Based on the comprehensive survey of various indexes of the hydrogenation products, the optimum evaluated process parameters of the catalyst are, the reaction temperature is above 320 ℃, the reaction pressure is 2.0-2.5 MPa, the hydrogen-to-oil ratio is 200-300 and the filled volumetric space velocity of the catalyst is 1.5-2.0 h -1 .