F111 Decomposition of hazardous and refractory chemicals by supercritical water

Suzuki, Akira; Iwamori, T.; Anjoh, Noriyuki; Kawasaki, Shin-ichiro

doi:10.1299/jsmeptec.2001.0_247

Cited by 1 publication

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“…[28][29][30][31] This process enables the one step treatment including both the dechlorination and decomposition of organic by-products at a relatively high reaction rate. But, this process should be carried out at a high pressure of 230-240 atm, and there is no practical reactor material due to the formation of hot concentrated hydrochloric acid solution as the by product.…”

Section: Decomposition Of Pcbs By Basic Molten Saltsmentioning

confidence: 99%

Decomposition Process for Polychlorobiphenyls by Means of Basic Molten Salts

et al. 2012

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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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Section: Decomposition Of Pcbs By Basic Molten Saltsmentioning

confidence: 99%