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Simulation on Crystallization Process of RDX

Author: ChangJunFang
Tutor: WangJianLong
School: University of North
Course: Applied Chemistry
Keywords: RDX Drowning-out Crystallization Crystallization Thermodynamics Crystallization Kinetics Simulation
CLC: TQ564
Type: Master's thesis
Year: 2011
Downloads: 112
Quote: 0
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Abstract


RDX commonly known as Hexogeon, as a high energy explosive, has been used in terms of both military and civilian applications, and the requirements are different at the crystal size due to the different application. In order to obtain the crystal size of RDX at the different conditions, the drowning-out crystallization was used in the present work. Due to the various crystallization conditions, the time-consuming experimental measurements and hard-to-find regulations, the programs of MATLAB were used and the crystallization process of RDX were studied on the basis of the experiments.In crystallization thermodynamic of RDX, the solubility and the supersolubility in acetone and acetone-water binary mixed solvents were determined at different temperatures by the laser monitoring observation technique. the metastable zone were also obtained under different conditions. Then the solubility in pure solvent of acetone were simulated by Apelblat three-parameter empirical equation and the solubility and the supersolubility in binary mixed solvents of acetone-water were simulated by (CNIBS) / Redlich-Kister equation, the simulated results agree well with the experimental data.Base on the experimental data in the crystallization thermodynamic, the surface entropy factors were estimated and the results show that the growth mechanism of crystal surface was screw dislocation model Then batch dynamic method was used to research the drowning-out crystallization kinetics behavior of RDX. The data were calculated with the grading method.The crystallization kinetic equations were established with size-independent growth rate model. The nucleation rate equation and the growth rate equation were determined. Based on the investigation of the crystallization thermodynamics, kinetics and analysis of crystallization process, combinning with population balance and mass balance equations, the mathematical model of the drowning-out crystallization process was established. The effects of the temperature and the stirring rate on the crystallization process and the quality of product were investigated. The correlation parameters of the crystallization process were obtained.

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CLC: > Industrial Technology > Chemical Industry > Explosives industry, match industry > Rampant explosives
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