Expand Hydrocracker Operating Window Through Process ...

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Figure 6 shows the peak temperature and bed dT of one of pre-treat bed in the DPRChydrocracker in the 2007 cycle. With the optimized stacked bed catalyst system, thisbed was operated at 7ºF higher peak temperature at end of run compared to theprevious cycle. The delta temperature in this bed was healthy throughout the full cycle.In the previous cycle, this bed DT went down as the peak temperature reached the ASATequilibrium (Figure 2).Figure 6 – DPRC <strong>Hydrocracker</strong> Pre-treat Bed Peak Temperature and Bed dT(One (1) of the Pre-Treated Beds Loaded with the Stacked Catalyst System in 2007 Cycle)Figure 6 shows the peak temperature and dT of one (1) of the pre-treat beds in the Deer Parkhydrocracker optimized with the stacked hydrotreating/ASA catalyst system. Thehydrocracker was able to operate at 7ºF higher peak temperature in the 2007 cycle comparedto previous cycle while maintaining healthy delta temperatures in the bed.AM-10-145Page 8
Figure 7 shows how the DPRChydrocracker feed rate and feed qualities were wellmaintained throughout the entire 2007 cycle, as opposed to the previous cycleperformance shown in Figure 1. The stacked bed system extended the pre-treat catalystcycle life and allowed the hydrocracker to operate at higher feed rate while processingmore difficult feed. This created significant economic benefit for the refinery.Figure 7 – Combined Feed Rate and Percent (%) 650ºF Minus in the 2007 CycleFigure 7 shows the percent of 650ºF minus material in the combined feed and fresh feed rate inthe 2007 cycle. Percent of 650ºF minus and fresh feed rate are on the Y axis and days on streamare on the X axis. The plot shows that the feed rate and feed quality were well maintainedthroughout the entire 2007 cycle as opposed to the previous cycle shown in Figure 1.AM-10-145Page 9
Page 1 and 2: Expand Hydrocracker Operating Windo
Page 3 and 4: equired nitrogen slip and to reach
Page 5 and 6: Aromatic Saturation (Wt%)temperatur
Page 7: Figure 5 - Zeolyst ASA volume in Hy
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

Expand Hydrocracker Operating Window Through Process ...

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