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Title: Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane

Abstract

Nonoxidative gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane in a nitrogen bath was investigated using a tubular plug flow reactor. Experiments were performed at atmospheric pressure, over a range of temperatures (673--1053 K) and residence times (0.1--2.0 s). Compared to the thermal decomposition of CBrF{sub 3}, the addition of CH{sub 4} to the reacting stream results in a substantial increase in the conversion of CBrF{sub 3}, with conversion levels rising with increasing content of CH{sub 4}. Generally, the conversion of both reactants increases with temperature or residence time. At high temperatures and an equal-molar CBrF{sub 3}/CH{sub 4} feed stream, the proportion of CBrF{sub 3} converted is always greater than that of CH{sub 4}. In addition to HBr and HF, the major products of the reaction were CHF{sub 3}, CH{sub 3}Br, and C{sub 2}H{sub 2}F{sub 2}, while minor products include C{sub 2}H{sub 4}, C{sub 2}H{sub 2}, C{sub 2}H{sub 3}Br, CHBrF{sub 2}, C{sub 2}F{sub 6}, C{sub 2}H{sub 3}F{sub 3}, C{sub 2}HBrF{sub 2}, C{sub 2}H{sub 3}F, C{sub 2}HF{sub 5}, C{sub 6}H{sub 5}F, C{sub 6}H{sub 5}BrF, CH{sub 2}Br{sub 2}, and H{sub 2}. Coke formation was observed above 960 K. A reaction mechanism for prediction of major and important minor species is presentedmore » and discussed. The reaction kinetics can be represented (at low conversion) by a second-order global reaction scheme with the following rate parameters: {kappa}{sub global} = 3.41 {times} 10{sup 15} (cm{sup 3}/mol{center_dot}s) exp({minus}180.2 (kJ/mol)/RT).« less

Authors:
; ;  [1]
  1. Univ. of Newcastle, Callaghan, NSW (Australia)
Publication Date:
OSTI Identifier:
697169
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; HALOGENATED ALIPHATIC HYDROCARBONS; FIRE EXTINGUISHERS; METHANE; THERMAL DEGRADATION; WASTE PROCESSING; CHEMICAL REACTION KINETICS; OZONE LAYER

Citation Formats

Li, K., Kennedy, E.M., and Dlugogorski, B.Z. Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane. United States: N. p., 1999. Web. doi:10.1021/ie990201f.
Li, K., Kennedy, E.M., & Dlugogorski, B.Z. Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane. United States. doi:10.1021/ie990201f.
Li, K., Kennedy, E.M., and Dlugogorski, B.Z. Wed . "Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane". United States. doi:10.1021/ie990201f.
@article{osti_697169,
title = {Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane},
author = {Li, K. and Kennedy, E.M. and Dlugogorski, B.Z.},
abstractNote = {Nonoxidative gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane in a nitrogen bath was investigated using a tubular plug flow reactor. Experiments were performed at atmospheric pressure, over a range of temperatures (673--1053 K) and residence times (0.1--2.0 s). Compared to the thermal decomposition of CBrF{sub 3}, the addition of CH{sub 4} to the reacting stream results in a substantial increase in the conversion of CBrF{sub 3}, with conversion levels rising with increasing content of CH{sub 4}. Generally, the conversion of both reactants increases with temperature or residence time. At high temperatures and an equal-molar CBrF{sub 3}/CH{sub 4} feed stream, the proportion of CBrF{sub 3} converted is always greater than that of CH{sub 4}. In addition to HBr and HF, the major products of the reaction were CHF{sub 3}, CH{sub 3}Br, and C{sub 2}H{sub 2}F{sub 2}, while minor products include C{sub 2}H{sub 4}, C{sub 2}H{sub 2}, C{sub 2}H{sub 3}Br, CHBrF{sub 2}, C{sub 2}F{sub 6}, C{sub 2}H{sub 3}F{sub 3}, C{sub 2}HBrF{sub 2}, C{sub 2}H{sub 3}F, C{sub 2}HF{sub 5}, C{sub 6}H{sub 5}F, C{sub 6}H{sub 5}BrF, CH{sub 2}Br{sub 2}, and H{sub 2}. Coke formation was observed above 960 K. A reaction mechanism for prediction of major and important minor species is presented and discussed. The reaction kinetics can be represented (at low conversion) by a second-order global reaction scheme with the following rate parameters: {kappa}{sub global} = 3.41 {times} 10{sup 15} (cm{sup 3}/mol{center_dot}s) exp({minus}180.2 (kJ/mol)/RT).},
doi = {10.1021/ie990201f},
journal = {Industrial and Engineering Chemistry Research},
number = 9,
volume = 38,
place = {United States},
year = {1999},
month = {9}
}