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- Title
Heat effects of NTO synthesis in nitric acid solution.
- Authors
Zhao, Yun; Chen, Shusen; Jin, Shaohua; Li, Zhihua; Zhang, Xuan; Wang, Luting; Mao, Yufeng; Guo, Haiying; Li, Lijie
- 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 (Δ H ), the heat of dissolution TO (Δ H ), the heat of reaction (Δ H ), the heat of crystallization of NTO (Δ H ) and the heat ( $$\Delta H_{{{\text{HNO}}_{{\text{3}}} }}$$ ) 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 Δ H was the main contribution to the total exothermic effect during synthesis processes in 66-96 % HNO; the contribution ability rank of other four thermal effects varied based on the concentration of HNO adopted.
- Subjects
NITROGEN tetroxide; NITRIC acid; SOLUTION (Chemistry); CHEMICAL synthesis; CALORIMETERS; DISSOLUTION (Chemistry)
- Publication
Journal of Thermal Analysis & Calorimetry, 2017, Vol 128, Issue 1, p301
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-016-5912-x