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Flash vacuum pyrolysis is not combustion March 29, 2009

Posted by fetzthechemist in PAHs.

In the March 23rd issue of C&R News, there is an item in the Science and Technology concentrates about a large PAH. It is the biphenylene dimer with an eight memer central ring. I need to check out the original paper, but at first glance it is either overstated or misleading. It mentions this as a combustion product, which really would be new. However, it also mentions it being produced through flash vacuum pyrolysis, which in spite of the name, is not a combustion process. It is the heating under vacuum of an unstable compound that is designed to decompose to another structure through condensation.

This compound is isomeric to coronene. In combustion, only coronene and two nonalternant isomers have been seen in real combustion, such as diesel exhaust.

Like I said, I need to see the original, full paper, but sometimes things get garbled in the telling.



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