Study outlines optimum ULSD hydrotreater design

ULSD HYDROTREATING—1A recent study for a grassroots 30,000-b/sd hydrotreater that can produce ultra-low sulfur diesel (ULSD) helped assess the critical process design issues for meeting future ULSD requirements.The feed, a 70:30 mixture of virgin distillate and FCC light cycle oil, was the basis for a previous Mustang Engineers & Constructors LP study for revamping an existing facility to meet the ULSD specification.1This first of two articles presents a comprehensive overview of design considerations for grassroots ULSD hydrotreaters. The chemistry of middle distillate sulfur species (see box), reaction process variables, and major factors influencing reactor design are covered.Eng...

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