Expand Hydrocracker Operating Window Through Process ...

. Cracking Catalyst SystemCriterion/Zeolyst have been leading innovators in hydrocracking catalyst technology formany years. By having an integrated research and manufacturing capability, thecompanies have been able to create a wide variety of products to meet specific needs ofeach refiner as shown in Figure 8 below.Figure 8 - A Portion of the Criterion Hydrocracking Catalyst PortfolioFigure 8 shows a portion of the Criterion/Zeolyst cracking catalyst portfolio. The middle distillateselectivity is on the Y axis and cracking activity is on the X axis. The cracking catalyst activity isincreased from left to right. The distillate selectivity is increased from bottom to top. Z-803catalyst is a naphtha/distillate flexible cracking catalyst.In the previous cycles, the DPRC hydrocracker was loaded with Criterion/Zeolyst naphthaselective cracking catalysts, Criterion/Zeolyst Z-863 and Z-753, which worked well forthe cycle objectives and refinery economics of that cycle. The 2007 cycle objectives ofthe this hydrocracker included maximizing unit throughput against its gas-processingcapability constraint and to have a flexible catalyst system to produce more diesel orgasoline depending on their relative margins. From the different options designed andevaluated, the team selected a cracking catalyst system using a Z-863/Z-803 stackedAM-10-145Page 10