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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:
5956165
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 38:9; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; CHEMICAL REACTION KINETICS; FIRE EXTINGUISHERS; HALOGENATED ALIPHATIC HYDROCARBONS; METHANE; OZONE LAYER; THERMAL DEGRADATION; WASTE PROCESSING; ALKANES; HYDROCARBONS; KINETICS; LAYERS; MANAGEMENT; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; PROCESSING; REACTION KINETICS; WASTE MANAGEMENT; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

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_5956165,
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},
issn = {0888-5885},
number = ,
volume = 38:9,
place = {United States},
year = {1999},
month = {9}
}