Equations estimate ASTM distillation loss in gasoline

William Ed Smith IV Consultant Newark, Del. William E. Morris Consultant Wilmington, Del. Gasoline blending and storage are among the final steps in a modern complex refinery, as shown here (upper right quadrant) at National Cooperative Refinery Association's 85,000-b/d refinery at McPherson, Kan. Photo from NCRA. In the ASTM D86 distillation test, pentanes minimize hydrocarbon loss by "holding back," or suppressing the volatility of, butanes. Studying blends of a depentanized gasoline gathered from a service station, the authors determined the effects of isobutane, normal butane, isopentane and normal pentane on percent hydrocarbon loss. This article presents equations to p...

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