Thermochemical investigation of hydrolysis of О-isobutyl-S-2-(N,N-diethylamino)ethylthionic ester of methylphosphonic acid

The hydrolysis of methylphosphonic acid О-isobutyl-S-2-(N,N-diethylamino)ethylthionic ester was studied by differential scanning calorimetry. It was found that at the equimolecular ratio of the reactants the heat effect of the process changes from 68.0 to 72.3 kJ/mol depending on impurities concentration in the initial product. It was shown that maximum heat flow is observed at 70-80°С, and the degree of decomposition of the initial substance ~57.2 %. The results of the investigations were used for the development of technology for chemical weapons destruction plants in Russian Federation.