THE HYDRODESULFURIZATION OF DIESEL FUEL TO MEET NEW EPA REQUIREMENTS
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PublisherThe University of Arizona.
AbstractIn December 1, 2010 the EPA reduced the allowable sulfur content in diesel fuel to 15 ppm, which is now known as ultra-low sulfur diesel (ULSD). In order to reach the 15 ppm sulfur maximum, the hydrodesulfurization unit in many refineries had to be upgraded. The group has been tasked with developing an upgrade catalytic hydrodesulfurization unit for a refinery in the Delaware Valley that can treat 35,000 barrels per stream day (BPSD) of liquid feedstock containing 1.9 wt % sulfur. Performance data from the existing catalytic hydrodesulfurization unit was used to predict the performance of the upgraded unit. ChemCAD software was used for the process calculations and the feed was modeled using boiling curve data. The desulfurization reaction kinetics were based on the reduction of dibenzothiophene. The project goals are to achieve a 99% recovery of diesel fuel while reducing the sulfur content below 15 ppm. The liquid feedstock will be run through a packed bed reactor filled with CoMo/Al2O3 catalyst where the sulfur compounds will react with hydrogen gas to form hydrogen sulfide gas. An amine contactor will be used to remove sour gas from the recycle hydrogen stream and a distillation column will produce diesel.