Low-capital crude unit revamp increases product yield

In 2001, Lyondell-Citgo Refining LP improved diesel yield by 4.8% and atmospheric gas oil (AGO) product yield by 0.5% on whole crude by implementing a low-capital cost revamp in its Houston refinery (OGJ, Mar. 18, 2002, p. 70; July 30, 1984, p. 197).Lyondell-Citgo produces more gas oil than its FCC can process; therefore, the crude revamp enabled the refiner to upgrade high-sulfur vacuum gas oil to diesel at an average of $2.50/bbl.Before the revamp, tray fouling in the atmospheric-column stripping section forced Lyondell-Citgo to lower the steam rate as the run-length progressed to avoid atmospheric tower bottoms (ATB) entrainment, which turns the AGO product black.The lower stripping st...

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