title: Destruction of methylphosphonic acid in a supercritical water oxidation bench-scale double wall reactor.
abstract: The destruction of methylphosphonic acid (MPA), a final product by hydrolysis/neutralization of organophosphorus agents such as sarin and VX (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothionate), was investigated in a a bench-scale, continuous concentric vertical double wall reactor under supercritical water oxidation condition. The experiments were conducted at a temperature range of 450-600 degrees C and a fixed pressure of 25 MPa. Hydrogen peroxide was used as an oxidant. The destruction efficiency (DE) was monitored by analyzing total organic carbon (TOC) and MPA concentrations using ion chromatography on the liquid effluent samples. The results showed that the DE of MPA up to 99.999% was achieved at a reaction temperature of 600 degrees C, oxygen concentration of 113% storichiometric requirement, and reactor residence time of 8 sec. On the basis of the data derived from experiments, a global kinetic rate equation for the DE of MPA and DE of TOC were developed by nonlinear regression analysis. The model predictions agreed well with the experimental data.
authors.affiliation: Supercritical Fluid Research Laboratory, Korea Institute of Science and Technology (KIST), 39-1 Hawolgok-dong, Seoungbuk-gu, Seoul, 136-791, Korea. vaveri@yahoo.com
authors.forename: Bambang
authors.initials: B
authors.lastname: Veriansyah
authors.forename: Eun-Seok
authors.initials: ES
authors.lastname: Song
authors.forename: Jae-Duck
authors.initials: JD
authors.lastname: Kim
mesh_terms: D002244:Carbon / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D002625:Chemistry, Organic / Q000295:instrumentation* / Q000379:methods*; D007700:Kinetics; D008697:Methane / Q000032:analysis; D009943:Organophosphorus Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D009943:Organophosphorus Compounds; D014867:Water; D002245:Carbon Dioxide; C032627:methylphosphonic acid; D002244:Carbon; D002248:Carbon Monoxide; D008697:Methane; D010100:Oxygen