Shock-tube pyrolysis of chlorinated hydrocarbons: Formation of soot

Journal Article · Thu May 01 00:00:00 EDT 1986 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(86)90051-9· OSTI ID:5331578

Frenklach, M; Hsu, J P; Miller, D L; Matula, R A

Soot formation in pyrolysis of chlorinated methanes, their mixtures with methane, and chlorinated ethylenes were studied behind reflected shock waves by monitoring the attenuation of an He-Ne laser beam. An additional single-pulse shock-tube study was conducted for the pyrolysis of methane, methyl chloride, and dichloromethane. The experiments were performed at temperatures 1300-3000K, pressures 0.4-3.6 bar, and total carbon atom concentrations (1-5) x 10/sup 17/ atoms/cm/sup 3/. The amounts of soot produced in the pyrolysis of chlorinated hydrocarbons are larger than that of their nonchlorinated counterparts. The sooting behavior and product distribution can be generally explained in terms of chlorine-catalyzed chemical reaction mechanisms. The pathway to soot from chlorinated methanes and ethylenes with high H:Cl ratio proceeds via the formation of C/sub 2/H, C/sub 2/H/sub 2/, and C/sub 2/H/sub 3/ species. For chlorinated hydrocarbons with low H:Cl ratio, the formation of C/sub 2/ and its contribution to soot formation at high temperatures becomes significant. There is evidence for the importance of CHCl radical and its reactions in the pyrolysis of dichloromethane.

• Research Organization: College of Engineering, Louisiana State Univ., Baton Rouge, LA 70803
• OSTI ID: 5331578
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 64:2; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKANES
ALKENES
ATTENUATION
CARBON
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINATION
DISPERSIONS
ELEMENTS
ETHYLENE
GAS LASERS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENATION
HELIUM-NEON LASERS
HIGH TEMPERATURE
HYDROCARBONS
KINETICS
LASER SPECTROSCOPY
LASERS
MEDIUM PRESSURE
METHANE
METHYL CHLORIDE
METHYLENE CHLORIDE
MIXTURES
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PYROLYSIS PRODUCTS
QUANTITY RATIO
REACTION KINETICS
SHOCK TUBES
SHOCK WAVES
SOOT
SPECTROSCOPY
YIELDS