Raman studies of Halon fire retardants

Conference · Tue Apr 01 04:00:00 EST 1986 · Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States)

OSTI ID:5538895

May, J H; Allen, F S; Ondrias, M R; Tapscott, R E; Beeson, H D; Zallen, D M

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-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States) Journal Volume: 31:2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COMBUSTION KINETICS
DECOMPOSITION
DISTILLATION
ELEMENTS
ETHANE
FIRE RESISTANCE
FLAMES
GAS CHROMATOGRAPHY
HYDROCARBONS
KINETICS
LASER SPECTROSCOPY
MASS SPECTROSCOPY
MATERIALS TESTING
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
RAMAN SPECTROSCOPY
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
TESTING
THERMOCHEMICAL PROCESSES
VACUUM DISTILLATION
VERY HIGH TEMPERATURE