Temperature and pressure effects on the product distribution of PTFE pyrolysis by means of qualitative, in-line FTIR analysis

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dc.contributor.author Bezuidenhoudt, Anya
dc.contributor.author Sonnendecker, Paul W.
dc.contributor.author Crouse, Philippus L.
dc.date.accessioned 2017-09-18T08:15:49Z
dc.date.issued 2017-08
dc.description.abstract The results of the depolymerisation of PTFE under steady operating conditions in a semi-automated, continuous depolymerisation system are presented. The influence of temperature and pressure on the selectivity of the three main products of depolymerisation (tetrafluoroethylene (TFE), hexafluoropropylene (HFP), and octafluorocyclobutane (OFCB)) was investigated via qualitative in-line FTIR analysis. No carrier gas was used, with the PTFE feed rate and experimental run time kept constant. The temperature and pressure ranges investigated were: 650 °C–750 °C and <10 kPa–40 kPa. The optimum operating conditions to maximise the three main products were determined using response surface methodology following a three-level face centered composite design. A TFE mole fraction of 0.95 and higher was achieved at operating conditions of ±675 °C and <10 kPa. HFP mole fractions of 0.19 and higher were achieved within the operating range of 744 °C–750 °C and 32 kPa up to 40 kPa. At operating conditions of 750 °C and 40 kPa, OFCB fractions of 0.5–0.55 were achieved. The OFCB and HFP mole fractions achieved differed from those previously mentioned in the literature. Analysis of the determined product specific kinetics indicates that the predominant HFP production pathway at low residence times (<3 s) is via the reaction of TFE with difluorocarbenes. At higher residence times the dominant reaction pathway is the dissociation OFCB. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2018-08-30
dc.description.librarian hj2017 en_ZA
dc.description.sponsorship The National Research Foundation (NRF) and the Fluoro-expansion Initiative (FEI) which is supported by the South African Department of Science and Technology (DST). en_ZA
dc.description.uri http://www.elsevier.com/locate/polydegstab en_ZA
dc.identifier.citation Bezuidenhoudt, A., Sonnendecker, P.W. & Crouse, P.L. 2017, 'Temperature and pressure effects on the product distribution of PTFE pyrolysis by means of qualitative, in-line FTIR analysis', Polymer Degradation and Stability, vol. 142, pp. 79-88. en_ZA
dc.identifier.issn 0141-3910 (print)
dc.identifier.issn 1873-2321 (online)
dc.identifier.other 10.1016/j.polymdegradstab.2017.05.025
dc.identifier.uri http://hdl.handle.net/2263/62271
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2017 Elsevier Ltd.. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Polymer Degradation and Stability. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Polymer Degradation and Stability, vol. 142, pp. 79-88, 2017. doi : 10.1016/j.polymdegradstab.2017.05.025. en_ZA
dc.subject Tetrafluoroethylene (TFE) en_ZA
dc.subject Hexafluoropropylene (HFP) en_ZA
dc.subject Octafluorocyclobutane (OFCB) en_ZA
dc.subject Polytetrafluoroethylene (PTFE) en_ZA
dc.subject PTFE depolymerisation en_ZA
dc.subject In-line FTIR en_ZA
dc.subject Regression analysis en_ZA
dc.subject Product-specific kinetics en_ZA
dc.subject Fourier transform infrared spectroscopy (FTIR) en_ZA
dc.subject Waste en_ZA
dc.subject Polymers en_ZA
dc.subject Decomposition en_ZA
dc.subject Thermogravimetry en_ZA
dc.title Temperature and pressure effects on the product distribution of PTFE pyrolysis by means of qualitative, in-line FTIR analysis en_ZA
dc.type Postprint Article en_ZA


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