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Altering Fuels

This article explores how the demand for certain fuel fractions, such as octane-gasoline, influences refining practices. It details the process of cracking larger hydrocarbons into smaller molecules to meet fuel requirements. The significance of octane ratings is explained, highlighting how higher ratings improve engine performance. The use of oxygenated fuels with additives to enhance octane ratings and reduce pollutants is discussed. Alternative methods to achieve effective combustion, including the integration of branched-chain octanes and renewable resources, are also examined.

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Altering Fuels

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  1. Altering Fuels

  2. Demand vs Supply • Some fractions not needed as much as other fractions (Need lots of octane-gasoline) • Can alter fractions to meet demands for fractions used more often.

  3. Cracking • Break larger hydrocarbons into 2 smaller hydrocarbons. • 16 carbon molecule broken into two 8 carbon molecules • C16H34 C8H18 + C8H16 • Always make an alkane + whatever is left over.

  4. Cracking • Cracking Video

  5. Octane Rating

  6. Octane Rating • At the gas pump the number for each grade of gasoline. (87, 89, 92) • The higher the number the higher the octane rating and the better it burns in your car. • Straight chain octane has a lower octane rating. Branched octane burns more efficiently.

  7. Oxygenated Fuels • Additives added to fuels to increase the octane rating. • Gasohol: 10% ethanol and 90 % gasoline works in most engines. • More complete combustion or lower the amount of air pollutants.

  8. Other ways to increase octane rating • 1) Add more branched chain octane. • 2) Add MTHF which can be made from renewable resources.

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