Altering fuels
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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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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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