Expand Hydrocracker Operating Window Through Process ...

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Figure 4 – Criterion <strong>Hydrocracker</strong> Pre-Treat Catalyst PortfolioThe tailored ASA catalysts are nitrogen-tolerant cracking catalysts with enhanced aciditycompared to a conventional hydrotreating catalyst, and they have the power to break opensaturated ring-compounds. Ring opening is irreversible, so it breaks through the aromaticsaturation equilibrium barrier and significantly increases the rate of hydrodenitrification attemperatures above the normal ASAT equilibrium barrier. The DPRC <strong>Hydrocracker</strong> CycleOptimization Team designed a stacked bed system in the 2007 cycle to maximize the pre-treatbed operating temperature window for their hydrocracker. Figure 5 shows examples of differentcustomers that are using this technology successfully at different optimum levels of the ASAcatalysts in the stacked system. Each hydrocracker has its optimum stacked bed system andCriterion/Zeolyst works with each customer to determine it. From the different options designedand evaluated, the team ofDPRC, Criterion/Zeolyst, and Shell Global Solutions selected ahydrocracking pre-treat catalyst stack system of CENTINEL Gold DN-3300 and ASA Z-503.AM-10-145Page 6
Figure 5 – Zeolyst ASA volume in Hydrocracking Pre-Treaters Commercial LoadingFigure 5 shows Zeolyst ASA catalyst in hydrocracking pre-treaters commercial loading. Thevolume percent of Zeolyst ASA is on the Y axis and type of hydrocracker is on the X axis.AM-10-145Page 7
Page 1 and 2: Expand Hydrocracker Operating Windo
Page 3 and 4: equired nitrogen slip and to reach
Page 5: Aromatic Saturation (Wt%)temperatur
Page 9 and 10: Figure 7 shows how the DPRChydrocra
Page 11 and 12: system. The Z-803 hydrocracking cat
Page 13 and 14: 3. Reactor InternalsThe performance
Page 15 and 16: 4. ConclusionsGuided by a refiner

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