Tom HuizingaShell Internationale Petroleum Mij.The HagueJos M.H. TheunissenRayong Refinery Co. Ltd.Rayong, ThailandHans Minderhoud, Rob van VeenKoninklijke/Shell-LaboratoriumAmsterdam An improved, second-stage hydrocracking catalyst has been developed by combining stabilized Y zeolites with amorphous silica alumina cracking components. A commercial application of this catalyst, along with a new, first-stage zeolitic hydrocracking catalyst, resulted in increased unit throughput and cycle length. HYDROCRACKING Shell Internationale Petroleum Mij. estimates that, worldwide, 115 hydrocrackers are processing 130 million metric tons/year (mty), or 2.5 million b/d of feed. Fig. 1 (54584...

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