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Solubilities of 2,6‐Diamino‐3,5‐dinitropyrazine‐1‐oxide in the Binary Mixtures of DMSO+H 2 O, DMF+H 2 O and NMP+H 2 O in the Temperature Range from 293.15 to 323.15 K under the Atmospheric Pressure
Author(s) -
Wang Yuqiao,
Jin Shaohua,
Li Tujuan,
Lan Guanchao,
Zhang Xiaopeng,
Zhang Zhengzheng,
Zhou Chang,
Chen Yu
Publication year - 2020
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201900155
Subject(s) - solubility , gibbs free energy , thermodynamics , enthalpy , solvent , chemistry , dissolution , recrystallization (geology) , gravimetric analysis , formamide , atmospheric temperature range , endothermic process , dimethyl sulfoxide , organic chemistry , paleontology , physics , adsorption , biology
Abstract Recrystallization is usually required for the application of 2,6‐Diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) as an energy material due to its poor crystal morphology. The study of its solubilities in binary solvent mixtures can provide primary support for optimizing the recrystallization and spheroidization conditions of LLM‐105. In the current work, the solubilities of LLM‐105 in the binary mixtures of dimethyl sulfoxide (DMSO)+H 2 O, N,N‐dimethyl‐formamide (DMF)+H 2 O and 1‐methyl‐2‐pyrrolidone (NMP) +H 2 O were measured by the gravimetric method in the temperature range from 293.15 K to 323.15 K under the atmospheric pressure. The results suggest that the solubility of LLM‐105 increases with the increase of temperature and the concentration of the solvent. The experimental data were then fitted with the modified Apelbalt equation, (CNIBS)/Redlich‐Kister equation and Jouyban‐Acree equation. All models fit the experimental data well, indicating that they can be used to predict the solubilities of LLM‐105 in the binary solvent mixtures. The thermodynamic parameters of the dissolution including enthalpy, standard entropy and Gibbs energy were calculated from the experimental data. It was found that the dissolutions of LLM‐105 in all test solvents were endothermic.