Destruction of chemical agent simulants in a supercritical water oxidation bench-scale reactor

Authors
Veriansyah, BambangKim, Jae-DuckLee, Jong-Chol
Issue Date
2007-08-17
Publisher
ELSEVIER
Citation
JOURNAL OF HAZARDOUS MATERIALS, v.147, no.1-2, pp.8 - 14
Abstract
A new design of supercritical water oxidation (SCWO) bench-scale reactor has been developed to handle high-risk wastes resulting from munitions demilitarization. The reactor consists of a concentric vertical double wall in which SCWO reaction takes place inside an inner tube (titanium grade 2, non-porous) whereas pressure resistance is ensured by a Hastelloy C-276 external vessel. The performances of this reactor were investigated with two different kinds of chemical warfare agent simulants: OPA (a mixture of isopropyl amine and isopropyl alcohol) as the binary precursor for nerve agent of sarin and thiodiglycol [TDG, (HOC2H4)(2)S] as the model organic sulfur heteroatom. High destruction rates based on total organic carbon (TOC) were achieved (> 99.99%) without production of chars or undesired gases such as carbon monoxide and methane. The carbon-containing product was carbon dioxide whereas the nitrogen-containing products were nitrogen and nitrous oxide. Sulfur was totally recovered in the aqueous effluent as sulfuric acid. No corrosion was noticed in the reactor after a cumulative operation time of more than 250 h. The titanium tube shielded successfully the pressure vessel from corrosion. (c) 2007 Elsevier B.V. All rights reserved.
Keywords
HIGH-TEMPERATURE; AQUEOUS-SOLUTIONS; WALL REACTOR; CORROSION; DECOMPOSITION; BEHAVIOR; WASTE; KINETICS; ALLOYS; SUWOX; HIGH-TEMPERATURE; AQUEOUS-SOLUTIONS; WALL REACTOR; CORROSION; DECOMPOSITION; BEHAVIOR; WASTE; KINETICS; ALLOYS; SUWOX; supercritical water oxidation; OPA; thiodiglycol; double wall reactor
ISSN
0304-3894
URI
https://pubs.kist.re.kr/handle/201004/134193
DOI
10.1016/j.jhazmat.2006.12.040
Appears in Collections:
KIST Article > 2007
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