Raman studies of Halon fire retardants
Raman spectroscopy can be used as a passive probe for the study of active systems. Various types of analytical determinations can be made without perturbing the system under study. Of interest is the elucidation of the extinction processes employed by Halon type extinguishing agents. Raman has in the past been used to study molecules such as H/sub 2/O, N/sub 2/, and CO/sub 2/ in flames. Halons and pyrolyzed products having vibrations that are more polarization sensitive than the above molecules, should then be readily analyzed in flames. As an initial approach to this problem, the authors are studying the pyrolysis of Halon 2402 (1,2 dibromotetrafluoroethane). The pyrolysis products are isolated using vacuum line techniques, and identified using GC/MS and Raman. A library of the Raman spectra from each component is being formed for subsequent use in flame analysis. Experimentally, they use a tube furnace with a specially designed tube, having detachable nitrogen traps on each end, and also capable of holding a vacuum. To simulate the combustion process, Halon 2402 is frozen in one of the nitrogen traps, and the whole system is brought to high vacuum. The Halon is then allowed to vacuum transfer through the pyrolysis tube, which is at approximately 790/sup 0/C, to the other nitrogen trap. This process is repeated several times. The products are then vacuum distilled, capturing fractions as they come over, in different, sealable cuvettes. Presently all fractions are studied in the gas phase at room temperature.
- Research Organization:
- Chemistry Dept., and New Mexico Engineering Research Inst., Univ. of New Mexico, Albuquerque, NM
- OSTI ID:
- 5538895
- Report Number(s):
- CONF-860425-
- Journal Information:
- Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States), Vol. 31:2; Conference: 191. American Chemical Society national meeting, New York, NY, USA, 13 Apr 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHANE
FIRE RESISTANCE
RAMAN SPECTROSCOPY
COMBUSTION KINETICS
FLAMES
GAS CHROMATOGRAPHY
MASS SPECTROSCOPY
MATERIALS TESTING
NITROGEN
PYROLYSIS
PYROLYSIS PRODUCTS
VACUUM DISTILLATION
VERY HIGH TEMPERATURE
ALKANES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
DISTILLATION
ELEMENTS
HYDROCARBONS
KINETICS
LASER SPECTROSCOPY
NONMETALS
ORGANIC COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
TESTING
THERMOCHEMICAL PROCESSES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)