Gas-phase reaction of halon 1301 (CBrF{sub 3}) with methane
- Univ. of Newcastle, Callaghan, NSW (Australia)
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).
- OSTI ID:
- 697169
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 9 Vol. 38; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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