John F. Hohnholt Valero Refining Co. Houston Woodrow K. Shiflett Arthur J. Suchanek Criterion Catalyst Co. LP Houston Increasing the operating severity of the atmospheric resid hydrodesulfurization (Arhds) unit at Valero Refining Co.'s Corpus Christi, Tex., refinery boosted yields of diesel and distillate products. After an initial run of two cycles on the original process licensed catalyst, catalysts and operating conditions were changed, resulting in a subsequent 30-month run. With a catalyst reload of four different silica and alumina hydrotreating catalysts in the reactors of the Arhds unit, the unit was operated for about 1...

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