March 2004

Engineering Case Histories

Case history: Revisit fundamentals for blending rules

Refiners use models to optimize operations, but are these models totally accurate?

Hartmann, J.C.M., Consultant

To contain operating expenses, refiners judiciously process transportation fuels with blend rules. The goal of these practices is to limit octane giveaway and maintain fuels specifications. This case history explores potential problems with blending rules. When hastening to simplify operations, refiners may deceive themselves with flawed data sets and blending algorithms. CASE HISTORY ? MOTOR GASOLINE In 1985 during a regular meeting, representatives from research, manufacturing, supply and marketing departments of an international oil company gathered to discuss developments of motor gasoline (mogas). A young member from the research labs had a very challenging subject: How t

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