- Title
- Non-oxidative thermal decomposition of endosulfan
- Creator
- Dharmarathne, W. N. K.; Mackie, J. C.; Kennedy, E. M.; Stockenhuber, M.
- Relation
- Australian Combustion Symposium 2015. Proceedings of the Australian Combustion Symposium 2015 (Parkville, Vic. 7-9 December, 2015) p. 116-119
- Relation
- ARC
- Relation
- http://www.anz-combustioninstitute.org/ACS2015/
- Publisher
- Combustion Institute, Australian and New Zealand Section
- Resource Type
- conference paper
- Date
- 2015
- Description
- Endosulfan is a member of the cyclodiene pesticide group of compounds, commonly used on the major crops of tobacco, cotton and fruits. This article presents the results of an experimental study on the non-oxidative thermal decomposition of endosulfan. The objective of the study was to identify its decomposition pathways and to gain an understanding into the formation of toxic species which may be introduced in the environment during its thermal decomposition. The experiments were conducted using a tubular reactor placed in a three zone heating furnace and operated with a dilute heated stream of endosulfan vapour in 99.999% helium. Gaseous species such as HCl, CO, C₂H₂ and SO₂ were detected and quantified by online Fourier Transform Infra-red spectroscopic analysis. The pyrolysis of endosulfan started at 300°C and the formation of HCl and CO commenced at 375°C. The initiation of the decomposition of endosulfan involves retro Diels-Alder elimination to hexachlorocyclopentadiene (HCCP) and the seven-membered ring compound, 4,7-dihydro-1,3,2-dioxathiepine-2-oxide (cyclic S=O). SO₂ was quantitatively eliminated from this cyclic S=O compound at increased temperatures, forming 2,5-dihydrofuran. As the temperature increased, we observed a rise in tertiary products including pentachlorocyclopentadiene (PCCP), tetrachlorostyrene (TCS) and different isomers of chlorinated styrene products. At 550°C, chlorinated benzene products were identified comprising pentachlorobenzene and tetrachlorobenzenes.
- Subject
- endosulfan; pyrolysis; hexachlorocyclopentadiene
- Identifier
- http://hdl.handle.net/1959.13/1316260
- Identifier
- uon:23117
- Identifier
- ISSN:1839-8170
- Language
- eng
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