生产超低硫柴油的加氢脱硫催化剂级配技术

Catalyst Stacking Technology for Producing Ultra-Low Sulfur Diesel

为了解决柴油超深度加氢脱硫过程受热力学平衡限制问题,更好地发挥不同类型催化剂的优势,在中型实验装置上,采用固定压力等级和空速的实验方法,考察了加氢反应活性好的W-Mo-Ni型催化剂和烷基转移反应活性好的Mo-Co催化剂对原料的适应性以及不同级配方式的加氢脱硫、脱氮效果。系统总结了原料、反应条件等对催化剂类型及其级配方式的影响,并建立了能够比较全面反映原料性质、反应条件和催化反应路径等对柴油超深度加氢脱硫反应影响的综合性的动力学模型。动力学模型计算结果表明,采用W-Mo-Ni/Mo-Co级配催化剂体系能够合理利用加氢反应器内不同区域反应条件的差异,达到更好的反应效果,并得到了工业应用结果的支持。

Diesel ultra-deep hydrodesulfurization （HDS） reaction is influenced by the thermodynamic equilibrium. Therefore, it is very important to exert different type catalyst＇s performance. In the pilot unit, through systematic experiments, the reaction results of W-Mo-Ni type catalyst with great hydrogenation reactivity and Mo-Co type catalyst with good transalkylation activity and their different stacking systems are investigated on the adaptability to different feed stocks and HDS, HDN activity. The effects of feed stocks, reaction conditions, catalysts and their stacking methods to ultra-deep HDS of diesel have been analyzed and discussed. On the same time, a comprehensive kinetic model of ultra-deep HDS has been developed which can describe the effects of feedstock, reaction conditions and reaction pathways. The kinetic model calculation results showed that the W-Mo-Ni/Mo-Co catalyst stacking system can best utilizing the reaction condition differences in reactor different zones, so achieving better reaction results, and the commercial data best supports this stacking method.