ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Decomposition Process for Polychlorobiphenyls by Means of Basic Molten Salts
Yasufumi YokkaMasayoshi KimuraTakeshi HandaKohei SasakiOsamu TakedaTsutomu YamamuraYuzuru Sato
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JOURNALS OPEN ACCESS

2012 Volume 52 Issue 10 Pages 1914-1920

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Abstract

The decomposition of polychlorobiphenyls (PCBs) by means of basic molten salts was investigated in order to construct a safe, simple and highly efficient waste treatment system for PCBs. PCBs (mono, di, tri, tetra, penta, hexa, hepta-chlorobiphenyls) solution was injected into basic molten salts (KOH–K2CO3 or NaOH–Na2CO3) at 773–973 K with oxygen or imitation air. The mass of residual PCBs in the exhaust after the decomposition and the mass of PCBs condensed inside the reaction vessel were measured by using gas chromatograph mass spectrometry, and the decomposition efficiency of PCBs was determined. The decomposition efficiency was also determined from the residual concentration of PCBs in the exhaust in some experiments. The decomposition efficiency was high regardless of the number of chlorine contained in PCBs and reached to very high of 99.999% in an optimum condition. Chlorine of PCBs was captured in basic molten salts, and organic compounds containing chlorine was not emitted from the molten salts. Some by-products comprising benzene rings were found at 773–873 K, but the by-products disappeared at 973 K.

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© 2012 by The Iron and Steel Institute of Japan
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