Affiliations: 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
Abstract: 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
H_2O_2 as an oxidant. The reaction
temperatures were ranged from 398 to 633°C 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°C. 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.
Keywords: supercritical water, oxidation kinetics, chemical agent, DMMP
