Experimental characterization of the low-temperature thermal decomposition of diisopropyl methylphosphonate (DIMP)

Document Type

Article

Publication Date

1-1-2024

Abstract

Diisopropyl methylphosphonate (DIMP) is a chemical weapon agent surrogate. Quantifying the rates of thermal decomposition of such compounds is important to enable predictions of spread of respective toxic vapors in different scenarios. An experimental setup is designed and built to quantify the rate of decomposition of DIMP at temperatures of 200–350 °C. Liquid DIMP is fed from a brass evaporator heated to 140 °C and vented with argon. It is mixed with a pre-heated carrier gas (air or nitrogen) in a steel flow reactor. The gas is sampled from the reactor after a certain residence time and sent to a Fourier transform infrared (FTIR) analyzer. Under 350 °C, the thermal decomposition of DIMP in air occurs much faster than in nitrogen. In air, the decomposition of DIMP can be described as the first order reaction with the rate constant kTs-1=107.4±2.5·exp-[Formula presented]. Despite measuring substantial reduction in the DIMP concentration due to its thermal decomposition, present measurements could not detect the presence of propene and other decomposition products.

Identifier

85179474887 (Scopus)

Publication Title

Chemical Engineering Journal

External Full Text Location

https://doi.org/10.1016/j.cej.2023.147832

ISSN

13858947

Volume

479

Grant

HDTRA1-19-1-0023

Fund Ref

U.S. Department of Defense

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