KINETICS OF THE AQUEOUS ALKALINE HOMOGENOUS HYDROLYSIS OF HIGH EXPLOSIVE 1, 3,5,7-TETRAAZA- 1, 3,5,7-TETRANITROCYCLOOCTANE (HMX)

Author:

Heilmann Harro M.1,Stenstrom Michael K.1,Hesselmann Rolf P. X.2,Wiesmann Udo3

Affiliation:

1. Department of Civil and Environmental Engineering, University of California Los Angeles, CA 90024-1600, USA

2. Swiss Federal 1nstitute for Environmental Science and Technology (EA WAG), Ueherlandstraβe 133. CH-8600 Dühendorf, Switzerland

3. Technische Universität Berlin, Straβe des 17 Juni, D-10623 Berlin, Germany

Abstract

In order to get basic data for the design of a novel treatment scheme for high explosives we investigated the kinetics for the aqueous alkaline hydrolysis of 1,3,5,7-tetraaza-1,3,5,7-tetranitrocyclooctane (HMX) and the temperature dependence of the rate constants. We used an HPLC procedure for the analysis of HMX. All experimental data could be fit accurately to a pseudo first-order rate equation and subsequent calculation of second-order rate constants was also precise. Temperature dependence could be modeled with the Arrhenius equation. An increase of 10°C led to an average increase in the second-order rate constants by the 3.16 fold. The activation energy of the second-order reaction was determined to be 111.9 ±0.76 kJ·moJ‒1. We found the alkaline hydrolysis to be rapid (less than 2.5% of the initial HMX-concentration left after 100 minutes) at base concentrations of 23 mmol oH‒/L and elevated temperatures between 60 and 80°C.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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