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    Octane number

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    Talib Al_Munawri
    Director-General
    Director-General

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman

    Octane number

    Post by Talib Al_Munawri on Fri Dec 04, 2009 8:44 pm



    Octane number

    The most commonly used measure of a gasoline's ability to burn
    without knocking is its octane number. Octane numbers compare
    a gasoline's tendency to knock against the tendency of a blend
    of two hydrocarbons – heptanes and 2,2,4-trimethylpentane, or
    isooctane – to knock. Heptanes (C7H16) are a long straight-chain
    alkane, which burns unevenly and produce a great deal of knocking.
    Highly branched alkanes such as 2,2,4-trimethylpentane are more
    resistance to knocking. Gasoline's that match a blend of 87% isooctane
    and 13% heptanes are given an octane number of 87.


    There are three ways of reporting octane number. Measurement made
    at high speed and high temperature is reported as motor octane
    numbers. Measurements taken under relatively mild engine conditions
    are known as research octane number. The road-index octane number
    reporting on gasoline pumps are an average of these two. Road-index
    octane numbers
    for a few pure hydrocarbons are given in the table
    below.


    By 1922 an umber of compounds had been discovered
    that could increase the octane number of gasoline. Adding oF
    gasoline, for example, can increase the octane number by 15 to 20
    units. This discovery gave rise to the first '' ethyl'' gasoline,
    and enabled the petroleum industry to produce aviation gasolines
    with octane number greater than 100.

    ssalim
    Member
    Member

    Posts : 1
    Join date : 2011-03-25
    Age : 30
    Location : Sultanate of Oman

    Re: Octane number

    Post by ssalim on Fri Mar 25, 2011 9:19 pm

    Thanks Talib for the valuable information about octane number..

      Current date/time is Sat Nov 18, 2017 3:16 pm