Study On Crystallization Process Of DNTF

3,4-bis(3-nitrofurazan-4-yl)furoxan(DNTF) is a novel energetic material of low melting point, high density and sensitivity. Further study shows that its comprehensive property is more superior than HMX but close to CL-20. Its excellent traits indicate that it is one of the directions of energetic materials research area. With the development of weapons and equipment, the demand of DNTF with high quality crystal is increasing. However, the DNTF particles obtained by synthetic reaction have non-uniform particle size distribution and irregular morphology. Therefore, a systematic academic and laboratorial research on the crystallization processes was done in detail.The solubilities and supersolubilities of DNTF in pure acetic acid, 1,2-dichloroethane and acetic acid- water binary system were measured in the temperature ranging from 298.15 to 338.15 K by the dynamic laser monitoring method, the metastable zone of DNTF in each solvent was obtained and the effect of solvent composition and temperature on the solubility and the width of metastable zone were discussed. The Apelblat and(CNIBS)/Redlich- Kister experience equation were adopted to correlate the experimental data, and the correlation result showed great agreement with the experimental data. The dissolution enthalpy, dissolution entropy, Gibbs energy, solid-liquid surface tension and surface entropy factor were estimated by using the experimental solubility data.According to the crystal grains density distribution shows that the population density of the particle size and the number of linear relationship, indicating growth DNTF crystallization crystals belong to unrelated size mode, you can use size-independent model to describe the growth rate of the crystal growth process DNTF.The theoretical analysis and experimental determination of cooling and dilution crystallization process of DNTF in different solvents were investigated by a batch dynamic method. Based on the equation of population balance, the kinetic datas were treated. According to the crystal grains density distribution, a size-independent growth kinetic model was established. the nucleation and growth rate equation of DNTF crystallization were determined performing multiple linear regression of experimental data by the least squares method. Analyzed and discussed the effects of the supersaturation, suspension density, temperature and stirring rate in the crystallization process of DNTF.The study can provide essential basic data and theoretical guidance for crystallization process optimization and scale up, it make industry crystallization not only obtain the desired patticle size of crystal products,but also meet the product quality, yield requirements.