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Gas-phase reaction of halon 1211 (CBrClF2) with methane

Tran, R., Kennedy, E.M. and Dlugogorski, B.Z. (2001) Gas-phase reaction of halon 1211 (CBrClF2) with methane. Industrial & Engineering Chemistry Research, 40 (14). pp. 3139-3143.

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The nonoxidative gas-phase reaction of halon 1211 (CBrClF2) with methane was studied using a tubular plug-flow alumina reactor at atmospheric pressure, over the temperature range of 673-1073 K, and at residence times between 0.1 and 1.3 s. With an equimolar feed of CBrClF2 and CH4, complete halon conversion was achieved at 1073 K for all residence times considered. The initial products of the reaction are CHClF2 and CH3Br, which are replaced by C2H2F2 at elevated temperatures. We suggest C2H2F2 is produced from the direct coupling of CH3 and CF2Cl radicals, which rapidly decompose to C2H2F2 and HCl. Minor products formed during reaction include C2H3F, CHF3, C2F4, CHBrF2, and C2HBrF2. The formation of CHClF2, C2F4, CHBrF2, and C2HClF2 was observed to reach a maximium at specific residence times, and formation of soot was detected above 943 K. Possible mechanistic pathways for major and some minor species are discussed.

Item Type: Journal Article
Publisher: American Chemical Society
Copyright: © 2001 American Chemical Society
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