February 2007

Special Report: Clean Fuels

Use real-time optimization for low-sulfur gasoline production

As the main sulfur source in the gasoline pool, fluid catalytic cracker (FCC) gasoline cuts must undergo severe hydrodesulfurization (HDS) processing to achieve ultra-low-sulfur gasoline (ULSG) pool s..

As the main sulfur source in the gasoline pool, fluid catalytic cracker (FCC) gasoline cuts must undergo severe hydrodesulfurization (HDS) processing to achieve ultra-low-sulfur gasoline (ULSG) pool specifications. The HDS task is intricate. Olefins in FCC gasoline are important contributors to both research and motor octane numbers (RON and MON). But they are also subject to co-hydrogenation to low-octane aliphatic compounds. Conventional HDS schemes, the method applied to diesel cuts, would generate road octane (average of RON plus MON) losses as high as six to eight octane numbers. Special HDS processes can be applied to minimize road octane losses to less than two in most cases. These

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