On the influence of heating rate and reaction vessel diameter on the onset temperature of the thermal explosion of monoethanolamine in nitric acid solutions

On the influence of heating rate and reaction vessel diameter on the onset temperature of the thermal explosion of monoethanolamine in nitric acid solutions.

Sokolov I. P., Smirnov A. V., Belova E. V.

In the context of assessing the potential explosion hazard of monoethanolamine during the concentration of its nitric acid solutions in NPP wastewater treatment processes, the influence of heating rate and apparatus diameter on the onset temperature of the transition of monoethanolamine−HNO₃ reaction to the thermal explosion regime with molecular nitrogen formation was studied. Thermal analysis was carried out in sealed vessels using differential scanning calorimetry and autoclave heating methods. Experimental dependencies of the thermal explosion onset temperature on the heating rate were determined. Based on the experimental and calculated data, the effect of the vessel diameter on the thermal explosion onset temperature was evaluated. A change in the reaction mechanism was observed with increasing temperature, HNO₃ concentration, and heating rate. A graphical plot of a combined T–C–d diagram with variable explosive range limits is presented.

► Keywords: monoethanolamine, nitric acid, differential scanning calorimetry, graphical approach, thermal explosion, explosive ranges.

Article language: Russian. Pp. 52–61. [in Russian]. DOI: 10.26277/SECNRS.2025.115.1.004.