Thermal Decomposition of Polychlorobiphenyls and Their Derivatives

The thermal stability and composition of the gas phase of Sovol technical mixture of polychlorobiphenyls was studied by synchronous thermal analysis and mass spectrometry in comparison with the derivatives synthesized by the reaction of the congeners with sodium methoxide or with polyethylene glycol...

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Bibliographic Details
Published in:Russian journal of applied chemistry 2020-08, Vol.93 (8), p.1254-1260
Main Authors: Maiorova, A. V., Kulikova, T. V., Safronov, A. P., Gorbunova, T. I., Pervova, M. G., Shunyaev, K. Yu
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Congeners
Decomposition
Derivatives
Industrial Chemistry/Chemical Engineering
Mass spectrometry
Organic Synthesis and Industrial Organic Chemistry
PCB
Polychlorinated biphenyls
Polyethylene glycol
Power consumption
Pyrolysis
Thermal analysis
Thermal decomposition
Thermal stability
Vapor phases
Vaporization
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Summary:The thermal stability and composition of the gas phase of Sovol technical mixture of polychlorobiphenyls was studied by synchronous thermal analysis and mass spectrometry in comparison with the derivatives synthesized by the reaction of the congeners with sodium methoxide or with polyethylene glycol in the presence of alkali. The obtained mixtures of methoxy + hydroxy + methoxyhydroxy or hydroxy + poly(ethylene glycol)oxy derivatives of polychlorobiphenyls are less stable thermally than the congeners of the Sovol mixture. In pyrolysis of a mixture of methoxy, hydroxy, and methoxyhydroxy derivatives, the vaporization is accompanied by decomposition with the formation of simple volatile substances. No vaporization is observed in the course of oxidative thermal decomposition of a mixture of hydroxy and poly(ethylene glycol)oxy derivatives. Thermal decomposition of the derivatives requires lower power consumption compared to polychlorobiphenyls and is characterized by decreased emission of hazardous chlorinated compounds.
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427220080194