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DMMP Paper - ChemRXiv.pdf (986.56 kB)

Hydrolysis of Dimethyl Methylphosphonate (DMMP) in Hot-Compressed Water

preprint
submitted on 14.04.2020 and posted on 16.04.2020 by Brian Pinkard, Shreyas Shetty, John Kramlich, Per G. Reinhall, Igor V. Novosselov

Dimethyl methylphosphonate (DMMP) is widely used as a chemical surrogate for G- and V-type nerve agents, exhibiting similar physiochemical properties, yet significantly lower toxicity. Continuous hydrolysis of DMMP in hot-compressed water is performed at temperatures from 200 to 300 °C, pressures of 20 and 30 MPa, and residence times from 30 to 80 s to evaluate the effects of pressure and temperature on reaction kinetics. DMMP hydrolysis is observed to follow pseudo-first-order reaction behavior, producing methylphosphonic acid and methanol as the only detectable reaction products. This is significant for the practical implementation of a continuous hydrothermal reactor for chemical warfare agent neutralization, as the process only yields stable, less-toxic compounds. Pressure has no discernible effect on the hydrolysis rate in compressed liquid water. Pseudo-first-order Arrhenius parameters are determined, with an activation energy of 90.17±5.68 kJ mol-1 and a pre-exponential factor of 107.51±0.58 s-1.

History

Email Address of Submitting Author

pinkardb@uw.edu

Institution

University of Washington

Country

United States

ORCID For Submitting Author

0000-0002-4517-4712

Declaration of Conflict of Interest

No conflict of interest

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in The Journal of Physical Chemistry A

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