Octane Modeling of Isobutanol Blending into Gasoline

Abstract

Thirty-four gasoline blendstocks for oxygenate blending were used to create finished gasoline blends with isobutanol content of 12.5 volume percent (vol. %) and 16 vol. %. The gasoline blendstocks and finished fuels were analyzed for octane number (research [RON] and motor [MON]) to determine the effect of blending isobutanol. Volumetric and molar linear blending models were developed to predict finished fuel RON and MON, starting from the properties and composition of the gasoline blendstocks and isobutanol. Results show the molar blending model provided a better fit for the experimental data than the volumetric blending model. The volumetric model was further improved by adding nonlinear terms, improving the error to within ∼1 ON. Gasoline blendstock properties impacted the finished fuel RON/MON, with paraffins having a synergistic effect with isobutanol and olefins and aromatics having an antagonistic effect.

Screening and evaluation of biomass upgrading strategies for sustainable transportation fuel production with biomass-derived volatile fatty acids

“…Cetane and octane numbers of mixtures were calculated as mole fraction weighted averages of individual component properties, as has been demonstrated previously. 78 , 79 , 80 Finally, mixture viscosities were calculated using the Grunberg-Nissan equation ( Table S1 ). 81 …”

Economic analysis of the benefits to petroleum refiners for low carbon boosted spark ignition biofuels

“…Also, previous research has shown that the determination of specific BOB characteristics (PIONA, RVP, etc.) would allow for a more specific blending octane number and a higher degree of accuracy rather than a generic calculation for blending octane numbers [34][35][36][37]. The same applies for RVP [38][39][40].…”

Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook

“…Achieving proper engine performance, good fuel economy and reduced emissions require the use of fuel with an octane rating recommended in the vehicle owner’s manual . Every car is designed and calibrated for a specific octane number. , Engines equipped with knock sensors can run at a lower octane by slowing ignition timing, but this will result in increased fuel consumption, poor handling, and reduced power, and knocking may still occur . Based on Table , we can conclude that almost all motor gasoline in the world market is high-octane: the average octane value of motor gasoline in the world varies from 80 to 100.…”