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Destruction of methylphosphonic acid in a supercritical water oxidation bench-scale double wall reactor

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Journal of Environmental Sciences 2011年第4期23卷 545-552页

作者： bambang veriansyah Eun-Seok Song Jae-Duck Kim Supercritical Fluid Research Laboratory Korea Institute of Science and Technology (KIST) 39-1 Hawolgok-dong Seoungbuk-gu Seoul 136-791 Korea

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°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°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.

关键词： supercritical water oxidation destruction efficiency methylphosphonic acid reaction kinetic nonlinear regression

Hydrothermal decomposition of pentachlorophenol in subcritical and supercritical water with sodium hydroxide addition

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Journal of Environmental Sciences 2007年第6期19卷 663-666页

作者： PRABOWO Benedictus veriansyah bambang KIM Jae-Duck Supercritical Fluid Research Laboratory Korea Institute of Science and Technology(KIST)-Department of Green Process and System EngineeringUniversity of Science and Technology(UST)39-1 Hawolgok-dongSeoungbuk-gu Seoul136-791Korea.

Hydrothermal decomposition of pentachlorophenol （PCP, C6HC150）, as the probable human carcinogen, was investigated in a tubular reactor under subcritical and supercritical water with sodium hydroxide （NaOH） addition. The experiments were conducted at a temperature range of 30（0-420℃ and a fixed pressure of 25 MPa, with a residence time that ranged from 10 s to 70 s. Under the reaction conditions, the initial PCP concentrations were varied from 0.25 to 1.39 mmol/L, and the NaOH concentrations were varied from 2.5 to 25 times of the concentrations of PCP. The result of this study showed that PCP conversion in supercritical water was highly dependent on the reaction temperature, residence time, and NaOH concentration. PCP conversion in subcritical water is, however, only dependent on reaction temperature. NaOH concentration and residence times were found to have little effect on PCP conversion in subcritical condition. It was found that NaOH concentration affected the dechlorinations of PCP in the supercritical water. The intermediates detected were proposed to be tetrachlorophenol and trichlorophenol, respectively.

关键词： pentachlorophenol hydrothermal decomposition supercritical water suberitical water

Decomposition kinetics of dimethyl methylphospate(chemical agent simulant) by supercritical water oxidation

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Journal of Environmental Sciences 2006年第1期18卷 13-16页

作者： bambang veriansyah Jae-Duck KIM Youn-Woo LEE Supercritical Fluid Research Laboratory Korea Institute of Science and Technology(KIST) 39-1 Hawolgok-dong Seoungbuk-gu Seoul 136-791 Korea. School of Chemical and Biological Engineering Seoul National University(SNU) San 56-1 Sillim-dong Gwanak-gu Seoul 151-744 Korea

Supercritical water oxidation （SCWO） has been drawing much attention due to effectively destroy a large variety of high-risk wastes resulting from munitions demilitarization and complex industrial chemical. An important design consideration in the development of supercritical water oxidation is the information of decomposition rate. In this paper, the decomposition rate of dimethyl methylphosphonate（DMMP）, which is similar to the nerve agent VX and GB（Sarin） in its structure, was investigated under SCWO conditions. The experiments were performed in an isothermal tubular reactor with a H2O2 as an oxidant. The reaction temperatures were ranged from 398 to 633℃ at a fixed pressure of 24 MPa. The conversion of DMMP was monitored by analyzing total organic carbon （TOC） on the liquid effluent samples. It is found that the oxidative decomposition of DMMP proceeded rapidly and a high TOC decomposition up to 99.99% was obtained within 11 s at 555℃. On the basis of data derived from experiments, a global kinetic equation for the decomposition of DMMP was developed. The model predictions agreed well with the experimental data.

关键词： supercritical water oxidation kinetics chemical agent DMMP