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Autoignition temperature (AIT) vs Pressure

Autoignition temperature (AIT) vs Pressure

Autoignition temperature (AIT) vs Pressure

(OP)
It'easy to find data about AIT's combustible at 1 atm. Where can I find a correlation law for different pressures?

RE: Autoignition temperature (AIT) vs Pressure

Since ignition usually occurs when the process fluid escapes, AIT is usually reported at atmospheric pressure. A noteable exception is the diesel engine. The only pressure data I am aware of is a short table in Bodurtha's book, Industrial Explosion Prevention and Protection. Table 3-2 lists Minimum AITs for Mineral Oils and Kerosine between 25 kPa and 10 MPa. AIT goes down as pressure increases as may be expected. The numbers for kero are 593 deg C at 25 kPa, 464 at 50 and 229 at 100.  

HAZOP at www.curryhydrocarbons.ca

RE: Autoignition temperature (AIT) vs Pressure

(OP)
Thank you. I expected that trend from Semenov's equation.
Unfortunately I don't know Bodurtha's book.
I'd need data about alkanes. What can you say?

RE: Autoignition temperature (AIT) vs Pressure


After a few minutes of Googleing I've found this site:


I wonder whether it is of any help. Anyhow, it might involve a payment to get the full article.

RE: Autoignition temperature (AIT) vs Pressure

(OP)
Well done!
This could be the most interesting document about my problem. I hoped to try an user-friendly correlation law, perhaps Semenov's coefficients.
I refer to this article surely.
Thanks

RE: Autoignition temperature (AIT) vs Pressure

(OP)
I read the full article. My doubts linger. Despite its abstract, the article doesn't provide a law or a model to correlate AIT with pressure.
Therefore I need your help again.
Someone has other ideas?
Maybe I'd begin to get Bodurtha's Table 3-2.

RE: Autoignition temperature (AIT) vs Pressure

Regarding alkanes, Bodurtha's Table 3-1 lists AIT for methane through n-Hexadecane at 101.325 kPa.  

HAZOP at www.curryhydrocarbons.ca

RE: Autoignition temperature (AIT) vs Pressure

(OP)
I would need a system to have same data at different pressures (i.e 2,5,10,15 atm).
AITs at ambient pressure are easy to find (Quintage and Zabetakis provide a lot).

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