2012•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
Kinetics of DBTs Hydrodesulfurization in a Coker Diesel
Zhao Lei-Yan, Ruiyu Zhao, Changlong Yin, Yunqi Liu, Liu Chenguang
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Abstract
The reactivity of the refractory sulfur compounds,i.e.dibenzothiophenes(DBTs) was investigated by hydrotreating a coker diesel with a commercial NiMo/γ-Al2O3 catalyst under commercial operation conditions of total pressure 5.0 MPa,liquid hourly space velocity 0.7-3.0 h-1,gas-to-liquid volume ratio 400 and temperature 330℃ in a 20 mL high-pressure reaction unit.Gas chromatography-pulsed flame photometric detector(GC-PFPD) was used to analyze sulfur compounds in the feed and the hydrodesulfurization(HDS) products.The kinetic model of first-order reaction of individual DBTs was built and the removal behaviors of various sulfur compounds in deep HDS process were studied.The results showed that DBT and its alkyl-derivatives,especially the DBTs with substituents at 4 position and 6 position,were the most refractory sulfur compounds.The order of the apparent reaction rate constant of individual sulfur compounds from high to low was DBT,4-MDBT,4-EDBT,3,6-DMDBT,4-E,6-MDBT,2,4,6-TMDBT,4,6-DMDBT.