Difference between revisions of "Octane"

From MoparWiki
Jump to: navigation, search
(Created page with " <!-- Start of Comments this information is to help the person collaborating on the Wiki Page Terminology Template Copy all of the information on this page and paste it ont...")
 
Line 1: Line 1:
<!-- Start of Comments this information is to help the person collaborating on the Wiki Page
 
Terminology Template
 
Copy all of the information on this page and paste it onto a new page for a particular Mopar car model
 
The standard for images are as Thumbnails of 300 pixels wide with a description, ie: [Image:FilenameUploaded|Thumb|300px|Short Photo Description]]
 
Change the Category below the Comments to the appropriate category(s). In the special pages you will find a link to the list of categories.
 
Enclosed the first instance of a Mopar key word in a double set of brackets so that it will link to its MoparWiki page
 
Example: [[Richard Petty]] raced a [[Plymouth]] [[Superbird]] during his 1970 season in [[NASCAR]].
 
End of comments - Delete nothing this line and above -->
 
 
[[Category:Needs Collaboration]] <!-- Remove from this category once Wiki is more than 50% complete -->
 
 
[[Category:Terminology]] <!-- Leave this line -->
 
[[Category:Terminology]] <!-- Leave this line -->
 
[[Category:Needs Collaboration]] <!-- Remove from this category once Wiki is more than 50% complete -->
 
[[Category:Needs Collaboration]] <!-- Remove from this category once Wiki is more than 50% complete -->
 
[[Category:Definitions]]
 
[[Category:Definitions]]
[[Category:Page Creation Templates]]
+
 
  
 
{{Template:Openx}} <!-- Do not remove this line -->
 
{{Template:Openx}} <!-- Do not remove this line -->
  
  
A liquid alkane hydrocarbon found in petroleum and existing in 18 isomeric forms, esp the isomer n-octane. Formula: C8H18
+
'''Octane''' is a  hydrocarbon and an alkane with the chemical formula C<sub>8</sub>H<sub>18</sub>, and the condensed structural formula CH<sub>3</sub>(CH<sub>2</sub>)<sub>6</sub>CH<sub>3</sub>.  Octane has many structural isomers that differ by the amount and location of branching in the carbon chain.  One of these isomers, 2,2,4-trimethylpentane (isooctane) is used as one of the standard values in the [[octane rating]] scale.
 +
 
 +
Octane is a component of gasoline. As with all low-molecular-weight hydrocarbons, octane is volatile and very flammable.
 +
 
 +
==Use of the term in gasoline==
 +
 
 +
"Octane" is colloquially used as a short form of "octane rating" (an index of a fuel's ability to resist [[engine knock]] at high [[compression]], which is a characteristic of octane's branched-chain isomers, especially iso-octane), particularly in the expression "high octane".
 +
 
 +
The octane rating was originally determined by mixing a gasoline made entirely of heptane and 2,2,4-trimethylpentane (a highly branched octane), and assigning anti-knock ratings of 0 for pure heptane and 100 for pure 2,2,4-trimethylpentane. The anti-knock rating of this mixture would be the same as the percentage of 2,2,4-trimethylpentane in the mix. Modern octane ratings of gasoline are given octane ratings equal to those from this original heptane/octane scale. Different isomers of octane can contribute to a higher or lower octane rating. For example, n-octane (the straight chain of 8 carbon atoms with no branching) has a -10 (negative) octane rating, while pure 2,2,4-trimethylpentane (a highly branched octane) has an octane rating of 100. Some fuels have an octane rating higher than 100, notably those containing [[methanol]] or [[ethanol]].
 +
 
 +
==Metaphorical use==
 +
 
 +
Octane became well known in American popular culture in the mid- and late 1960s, when gasoline companies boasted of "high octane" levels in their gasoline advertisements.
 +
 
 +
The compound adjective "high-octane", meaning powerful or dynamic, is recorded in a figurative sense from 1944. By the mid-1990s, the phrase was commonly being used as an intensifier and has found a place in modern English vernacular.
 +
 
 +
==Isomers==
 +
 
 +
Octane has 18 structural isomers (24 including stereoisomers):
 +
 
 +
*    Octane (n-octane)
 +
*    2-Methylheptane
 +
*    3-Methylheptane (2 enantiomers)
 +
*    4-Methylheptane
 +
*    3-Ethylhexane
 +
*    2,2-Dimethylhexane
 +
*    2,3-Dimethylhexane (2 enantiomers)
 +
*    2,4-Dimethylhexane (2 enantiomers)
 +
*    2,5-Dimethylhexane
 +
*    3,3-Dimethylhexane
 +
*    3,4-Dimethylhexane (2 enantiomers + 1 meso compound)
 +
*    3-Ethyl-2-methylpentane
 +
*    3-Ethyl-3-methylpentane
 +
*    2,2,3-Trimethylpentane (2 enantiomers)
 +
*    2,2,4-Trimethylpentane (isooctane)
 +
*    2,3,3-Trimethylpentane
 +
*    2,3,4-Trimethylpentane
 +
*    2,2,3,3-Tetramethylbutane
  
 
{{Template:BottomWiki}} <!-- Do not remove this line -->
 
{{Template:BottomWiki}} <!-- Do not remove this line -->
Line 23: Line 50:
 
== [[References]] ==
 
== [[References]] ==
  
 +
*https://en.wikipedia.org/wiki/Octane
 
*
 
*

Revision as of 02:45, 3 April 2020





Octane is a hydrocarbon and an alkane with the chemical formula C8H18, and the condensed structural formula CH3(CH2)6CH3. Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers, 2,2,4-trimethylpentane (isooctane) is used as one of the standard values in the octane rating scale.

Octane is a component of gasoline. As with all low-molecular-weight hydrocarbons, octane is volatile and very flammable.

Use of the term in gasoline

"Octane" is colloquially used as a short form of "octane rating" (an index of a fuel's ability to resist engine knock at high compression, which is a characteristic of octane's branched-chain isomers, especially iso-octane), particularly in the expression "high octane".

The octane rating was originally determined by mixing a gasoline made entirely of heptane and 2,2,4-trimethylpentane (a highly branched octane), and assigning anti-knock ratings of 0 for pure heptane and 100 for pure 2,2,4-trimethylpentane. The anti-knock rating of this mixture would be the same as the percentage of 2,2,4-trimethylpentane in the mix. Modern octane ratings of gasoline are given octane ratings equal to those from this original heptane/octane scale. Different isomers of octane can contribute to a higher or lower octane rating. For example, n-octane (the straight chain of 8 carbon atoms with no branching) has a -10 (negative) octane rating, while pure 2,2,4-trimethylpentane (a highly branched octane) has an octane rating of 100. Some fuels have an octane rating higher than 100, notably those containing methanol or ethanol.

Metaphorical use

Octane became well known in American popular culture in the mid- and late 1960s, when gasoline companies boasted of "high octane" levels in their gasoline advertisements.

The compound adjective "high-octane", meaning powerful or dynamic, is recorded in a figurative sense from 1944. By the mid-1990s, the phrase was commonly being used as an intensifier and has found a place in modern English vernacular.

Isomers

Octane has 18 structural isomers (24 including stereoisomers):

  • Octane (n-octane)
  • 2-Methylheptane
  • 3-Methylheptane (2 enantiomers)
  • 4-Methylheptane
  • 3-Ethylhexane
  • 2,2-Dimethylhexane
  • 2,3-Dimethylhexane (2 enantiomers)
  • 2,4-Dimethylhexane (2 enantiomers)
  • 2,5-Dimethylhexane
  • 3,3-Dimethylhexane
  • 3,4-Dimethylhexane (2 enantiomers + 1 meso compound)
  • 3-Ethyl-2-methylpentane
  • 3-Ethyl-3-methylpentane
  • 2,2,3-Trimethylpentane (2 enantiomers)
  • 2,2,4-Trimethylpentane (isooctane)
  • 2,3,3-Trimethylpentane
  • 2,3,4-Trimethylpentane
  • 2,2,3,3-Tetramethylbutane

Random Page | Longest Wikis | Oldest Wikis | Newest Images | Newest Wikis | List of Categories | List of Every Freakin Wiki



Register to Edit
It takes less than 5 minutes to request registration for editing, and we try to approve within 24 hours. Click the Register Link in the Top Bar.
MoparWiki Help
While editing Wikis may at first glance appear a little overwhelming, it really isn't. You will find this site's HELP (link found in the sidebar) to be very strong and easy to understand. The best way to start is with small edits and working on your user page -- and you will become a Pro in no time.

References