Abstract
The heat effects in the case of manufacture process of nitration 1,2,4-triazol-5-one (TO) in nitric acid solution were distinguished and determined using the calorimeters of DSC200F3, C80 and E856; the influence of these heats on the total exothermic effect during manufacture process was examined. Five kinds of thermal effects were differentiated and measured: the heat of process of dosing TO (ΔHTO,dosing), the heat of dissolution TO (ΔHTO,dissolution), the heat of reaction (ΔHr), the heat of crystallization of NTO (ΔHNTO,crystallization) and the heat (ΔHHNO3) caused by changes in concentration of nitric acid. The data on dissolution heats of TO and NTO in nitric acid with different concentrations in the 0–98.4 % range and isobaric heat capacity of TO over the temperature range of 0–90 °C are determined. The main results of examination showed: The ΔHr was the main contribution to the total exothermic effect during synthesis processes in 66–96 % HNO3; the contribution ability rank of other four thermal effects varied based on the concentration of HNO3 adopted.
Original language | English |
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Pages (from-to) | 301-310 |
Number of pages | 10 |
Journal | Journal of Thermal Analysis and Calorimetry |
Volume | 128 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Apr 2017 |
Keywords
- 1,2,4-Triazol-5-one
- 3-Nitro-1,2,4-triazol-5-one
- Heat effect
- NTO
- Nitration
- Synthesis