Thermal decomposition of ethylbenzene, styrene, and bromophenylethane: UV absorption study in shock waves
Shock wave studies of the pyrolysis of ethylbenzene, isopropylbenzene, tert-butylbenzene, styrene, and 1-bromo-1-phenylethane were performed using UV molecular absorption spectroscopy. By extensive spectral studies over the range 190-330 nm the overlapping absorption continua could be separated. Key observations in ethylbenzene pyrolysis were the dominance of a primary C-C bond split, the comparable fast fragmentation of benzyl radicals in agreement with observations from other benzyl sources, and the evidence for nonnegligible styrene formation. The following rate constants were derived: ethylbenzene ..-->.. CH/sub 3/ + benzyl, k/sub 1/ = 10/sup 15.55/ exp(-306.7 kJ mol/sup /minus/1//RT) s/sup +/minus/1/; styrene ..-->.. benzene + acetylene, k/sub 15/ = 10/sup 11.2/ exp(-244.5 kJ mol/sup /minus/1//RT) s/sup /minus/1/; 1 bromo-1-phenylethane ..-->.. HBr + styrene, k/sub 22/ = 10/sup 12.5/ exp(-160 kJ mol/sup /minus/1//RT) s/sup /minus/1/; benzyl fragmentation rates were identical with results from toluene, benzyl iodide, benzyl chloride, and other benzyl precursors. There is evidence for a dominant C-C bond split in isopropylbenzene and tert-butylbenzene pyrolysis as well.
- Research Organization:
- Universitaet Goettingen (Germany, F.R.)
- OSTI ID:
- 5992177
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
025000 -- Petroleum-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ABSORPTION SPECTROSCOPY
ALKYLATED AROMATICS
AROMATICS
BENZENE
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PYROLYSIS
REACTION KINETICS
SHOCK WAVES
SPECTRA
SPECTROSCOPY
STYRENE
THERMOCHEMICAL PROCESSES
ULTRAVIOLET SPECTRA