You are here:
FORMATION OF TRACE BYPRODUCTS IN THE PREMIXED FLAMES OF CH3CL/C2H4. (R825412)
Citation:
Huang, J. W., I. Onal, AND S. M. Senkan. FORMATION OF TRACE BYPRODUCTS IN THE PREMIXED FLAMES OF CH3CL/C2H4. (R825412). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 31:1372-1381, (1997).
Description:
The chemical structure of an atmospheric pressure, fuel-rich (equivalence
ratio 3.06), flat flame of a chloromethane and ethylene
(CH3Cl/C2H4 = 1.99) has been studied
experimentally using both heated microprobe and cold trap sampling techniques
followed by high-resolution gas chro matography/mass spectrometry (GC/MS). The
identities and absolute concentrations of more than 50 major and minor
hydrocarbon and chlorinated hydrocarbon species have been established, including
a large number of aromatics, substituted aromatics, and polycyclic aromatic
hydrocarbons (PAHs). Although some chlorinated PAHs were also detected,
unsubstituted aromatics dominated the PAH product distribution. Mole fractions
determined were in the range of 0.45-2.0 ? 10-7, with the
heaviest PAHs at mass 226 (C18H10,
benzo[ghi]fluoranthene and cyclopenta- [cd]pyrene). The
measurements indicated the selective suppression of certain PAHs, e.g.,
cyclopenta[cd]pyrene, in the presence of HCl when compared to regular
hydrocarbon flames. Heated silica surfaces of the sampling probe and transfer
lines were also noted to chlorinate select PAHs, such as pyrene and
acenaphthylene. The mole fraction profiles of many of the products first
increased, then decreased, and increased again in the post-flame zone. A number
of oxygenated aromatics were also detected. These measurements provide new
information on the identities and levels of hazardous air pollutants formed in
the incineration of chlorinated hydrocarbons and represent useful data for the
development and validation of detailed reaction mech anisms.