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), Vol. 64:2
• Country of Publication: United States
• Language: English

Related Subjects

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