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Altering Fuels. 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. Cracking. Break larger hydrocarbons into 2 smaller hydrocarbons.

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Presentation Transcript
demand vs supply
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.
cracking
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.
cracking1
Cracking
  • Cracking Video
octane rating1
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.
oxygenated fuels
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.
other ways to increase octane rating
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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