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- Title
Global Emissions of Perfluorocyclobutane (PFC-318, c-C<sub>4</sub>F<sub>8</sub>) Resulting from the Use of Hydrochlorofluorocarbon-22 (HCFC-22) Feedstock to Produce Polytetrafluoroethylene (PTFE) and related Fluorochemicals.
- Authors
Mühle, Jens; Kuijpers, Lambert J. M.; Stanley, Kieran M.; Rigby, Matthew; Western, Luke M.; Kim, Jooil; Park, Sunyoung; Harth, Christina M.; Krummel, Paul B.; Fraser, Paul J.; O'Doherty, Simon; Salameh, Peter K.; Schmidt, Roland; Young, Dickon; Prinn, Ronald G.; Wang, Ray H. J.; Weiss, Ray F.
- Abstract
Emissions of the potent greenhouse gas perfluorocyclobutane (c-C4F8, PFC-318, octafluorocyclobutane) into the global atmosphere inferred from atmospheric measurements have been increasing sharply since the early 2000s. We find that these inferred emissions are highly correlated with the production of hydrochlorofluorocarbon-22 (HCFC-22, CHClF2) for feedstock (FS) uses, because almost all HCFC-22 FS is pyrolyzed to produce (poly)tetrafluoroethylene ((P)TFE, Teflon) and hexafluoropropylene (HFP), a process in which c-C4F8 is a known by-product, causing a significant fraction of global c-C4F8 emissions. We find a global emission factor of ~0.003 kg c-C4F8 per kg of HCFC-22 FS pyrolyzed. Mitigation of these c-C4F8 emissions, e.g., through process optimization, abatement, or different manufacturing processes, such as electrochemical fluorination, could reduce the climate impact of this industry. While it has been shown that c-C4F8 emissions from developing countries dominate global emissions, more atmospheric measurements and/or detailed process statistics are needed to quantify country to facility level c-C4F8 emissions.
- Subjects
FEEDSTOCK; POLYTEF; ATMOSPHERIC sciences; CLIMATOLOGY; EARTH sciences; PHYSICAL sciences
- Publication
Atmospheric Chemistry & Physics Discussions, 2021, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2021-857