Corrosion on continuous supercritical water oxidation for polychlorinated biphenyls

Autor:	C. C. Liew, Kiyotaka Hatakeda, Yutaka Ikushima, Norio Saito, Takafumi Aizawa
Rok vydání:	2001
Předmět:	Supercritical water oxidation Materials science Metallurgy Alloy Titanium alloy chemistry.chemical_element engineering.material Condensed Matter Physics Supercritical fluid Corrosion Ion chemistry Chlorine engineering Effluent
Zdroj:	High Pressure Research. 20:393-401
ISSN:	1477-2299 0895-7959
DOI:	10.1080/08957950108206187
Popis:	The corrosion resistance of Hastelloy C-276 and titanium alloy G5 against C1 anion which was generated by supercritical water oxidation (scWO) of 3-chlorobiphenyl (3-PCB) in a flow reactor was investigated over a period of 336 hours at a constant pressure of 30 MPa. The condition of the scWO reaction zone was fixed at 750 K. The concentration of chlorine in the effluent collected after cooling to ambient temperature was about 850 wppm. The Hastelloy C-276 has a nominal ratio of approximately 3.7 Ni/l Cr. The Ni/Cr ratio in the effluent was the same with the nominal ratio, and the Hastelloy C-276 was proved to be corroded on the surface located between the bottom of the reactor and the cooling parts, which are under sub- and near- critical conditions of water. The corrosion rate was found to be 5 to 34mm/y in the zone where the temperature ranged from 543 K to 650 K and the corrosion spread over the whole surface of the alloy; however, one can hardly observe such a serious corrosion except the zon...
Databáze:	OpenAIRE
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