Catalyst Stacking Technology for Producing Ultra-Low Sulfur Diesel
1. Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, China; 2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Abstract 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.
