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Lokhat D, Starzak M, Ramjugernath D. New Insights into the Kinetics of the Gas-Phase Oxidation of Hexafluoropropene. PROGRESS IN REACTION KINETICS AND MECHANISM 2017. [DOI: 10.3184/174751916x14764433065222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The gas-phase reaction of hexafluoropropene and molecular oxygen was investigated in a tubular flow reactor at 450 kPa and within a temperature range of 463–493 K using HFP/O2 mixtures containing 20–67% HFP on a molar basis. Capillary and packed column chromatography served as the main analytical technique. The reaction yielded HFPO, COF2, CF3COF, C2F4 and c-C3F6 as gas-phase products. High molecular weight oligomers were also formed. The oligomers were found to have a polyoxadifluoromethylene structure according to elemental and 19F NMR analysis. At 493 K HFP is proposed to undergo oxygen-mediated decomposition to difluorocarbene radicals, yielding greater quantities of difluorocarbene recombination products. Kinetic parameters for a revised model of the oxidation process were identified through least squares analysis of the experimental data.
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Affiliation(s)
- David Lokhat
- Reactor Technology Research Group, School of Engineering, University of KwaZulu-Natal, Durban 4041, South Africa
| | - Maciej Starzak
- Reactor Technology Research Group, School of Engineering, University of KwaZulu-Natal, Durban 4041, South Africa
| | - Deresh Ramjugernath
- Reactor Technology Research Group, School of Engineering, University of KwaZulu-Natal, Durban 4041, South Africa
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Lokhat D, Ramjugernath D, Starzak M. Gas-phase equilibrium constants for the thermally initiated oxidation of hexafluoropropene with molecular oxygen. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3437] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- David Lokhat
- Reactor Technology Research Group, School of Engineering; University of KwaZulu-Natal; Durban 4041 South Africa
| | - Deresh Ramjugernath
- Reactor Technology Research Group, School of Engineering; University of KwaZulu-Natal; Durban 4041 South Africa
| | - Maciej Starzak
- Reactor Technology Research Group, School of Engineering; University of KwaZulu-Natal; Durban 4041 South Africa
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