Expand Hydrocracker Operating Window Through Process ...

Figure 11 provides a graphical view of how the unit was able to operate at a higher netconversion range within the fractionator overhead gas handling limit in the 2007 cycle. Thisimprovement was achieved through the combination of a tailored catalyst system, state-of-artreactor internals, and new operating strategy. Previous Cycle • 2007 CycleFigure 11 – Fractionator Overhead Vapor Production Versus Net ConversionFigure 11 shows the fractionator overhead vapor production versus net conversion in the previouscycle and in the 2007 cycle. The overhead vapor production rate is on the Y axis and netconversion is on the X axis. This plot provides a graphical view of how the unit was able tooperate at a higher net conversion range within the fractionator overhead gas handling limit inthe 2007 cycle.AM-10-145Page 14