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auto ignition temperature
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Source：Internet Author：Unknow Pubdate：2008-04-15
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rgrokkam (Chemical)
20 Oct 07 4:54
Is there any relation between auto ignition temperature and C-H ratio?
Many thanks
owg (Chemical)
20 Oct 07 7:33
In a homologous series of organic compounds, the Auto ignition temperature (AIT) decreases with increasing molecular weight. Also a branched compound will have a higher AIT than the corresponding straight-chain compound. There is a plot for straight chain paraffins in one of the NFPA publications. The subject is discussed in Bodurtha's book on Industrial Explosion Prevention and Protection. HAZOP at www.curryhydrocarbons.ca
25362 (Chemical)
20 Oct 07 8:34
The only probable exception to owg's statement is acetylene.
From the net:
AIT = Minimum Autoignition Temperature in oC under test conditions. 字串6
AIT
n-butane 370
n-pentane 260
n-hexane 225 字串6
n-heptane 225
n-octane 220
n-decane 210
n-dodecane 204
n-tetradecane 200 字串4
2-methylpropane 460
2-methylbutane 420
2-methylpentane 306
2,2,3-trimethylbutane 420
2,2,4-trimethylpentane 415
cyclopentane 380 字串9
cyclohexane 245
methylcyclohexane 250
benzene 560
toluene 480
ethyl benzene 430 字串8
meta-xylene 463
para-xylene 530
ortho-xylene 530
dcasto (Chemical)
20 Oct 07 21:25
Ethylene and acetylene auto ignition temperature needs clarification. These two chemicals decompose into C +CH4 + H2, raising the pressure by a factor of three and giving off large amounts of energy. Their auto decomposition temperature is a function of pressure. Quite a tricky pair.
字串4
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