Property Analysis of Ethanol--Natural Gasoline--BOB Blends to Make Flex Fuel

Teresa Alleman, Janet Yanowitz

Research output: NRELTechnical Report


Ten natural gasolines were analyzed for a wide range of properties, including Reid vapor pressure (RVP), benzene, sulfur, distillation, stability, metals, and aromatic content, to determine their quality. Benzene and sulfur content were sufficiently low in all but one of the samples that they could be blended without further upgrading. Four of these samples were selected to blend with blendstock for oxygenate blending (BOB) and ethanol to produce E51, E70, and E83 blends, targeting 7.8 and 9.0-psi finished fuels. The volume of each component in the blend was estimated using the Reddy model, with the assumption that the BOB and natural gasoline blend linearly and behave as a single component in the model calculations. Results show that the Reddy model adequately predicts the RVP of the finished blend for E51 and E70, but significantly underpredicts the RVP of E83 blends by nearly 2 psi. It is hypothesized that the underprediction is a function of the very low aromatic content of the E83 blends, even compared to the E51 and E70 blends.
Original languageAmerican English
Number of pages33
StatePublished - 2016

NREL Publication Number

  • NREL/TP-5400-67243


  • blendstock for oxygenate blending (BOB)
  • ethanol
  • flex fuel
  • natural gasoline blending
  • Reddy model


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