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Hao H.-Y.,University of Science and Technology Beijing | Wang F.-J.,Beijing Institute of Technology | Zhang Y.-H.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Sun J.,Qingyang Chemical Industry Corporation
Hanneng Cailiao/Chinese Journal of Energetic Materials

Nitrocellulose samples (NC) with A, B, C, and D grade were synthesized by nitrating Canadian softwood in HNO3/H2SO4/H2O and HNO3/CH2Cl2, respectively. The nitrogen content and nitrogen content distribution (uniformity of nitration) of nitrocellulose were analyzed by a polarizing microscope. Using high-pressure steam explosion technology, soft wood was treated before processing. The effect of steam explosion treatment on the nitrogen content distribution of high nitrogen B and low nitrogen D grade NC was discussed. Results show that the nitrogen content distribution of nitration product from HNO3/CH2Cl2 is more uniform than that of product from HNO3/H2SO4/H2O under the same nitrogen content condition. Uniformities of nitration indicators of NC of A, B, C and D grade improve by 16.9%, 17.5%, 16.8% and 25.7%, respectively. Steam explosion preprocess can improve nitrogen content and uniformity of product in the same nitrification system because the efficiency of nitration agents diffusion to cellulose fiber interior is improved by this treatment, and thus the uniformity for B grade NC can increase by 6.06% and for D grade NC by 7.56%. ©, 2014, Institute of Chemical Materials, China Academy of Engineering Physics. All right reserved. Source

Wang Y.,Beijing Institute of Technology | Qi C.,Beijing Institute of Technology | Song J.-W.,Qingyang Chemical Industry Corporation | Zhao X.-Q.,Beijing Institute of Technology | And 2 more authors.
Journal of Molecular Modeling

A series of trinitromethyl/trinitroethyl substituted derivatives of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazatetracyclo[5,5,0, 0 3.11,05.9] dodecane (CL-20) were designed and investigated by theoretical methods. Intramolecular interactions between the trinitromethyl/trinitroethyl and the cage were investigated. The effects of trinitromethyl/trinitroethyl groups on stability of the parent compound are discussed. The results reveal a mutual influence of bond length and dihedral angle between the trinitromethyl and the cage. Compared to CL-20, the sensitivity of derivatives is barely affected. Properties such as density, heat of formation and detonation performance of these novel compounds were also predicted. The introduction of the trinitromethyl group can significantly enhance the oxygen balance, density and detonation properties of the parent compound. The remarkable energy properties make these novel cage compounds competitive high energy density materials. © 2012 Springer-Verlag Berlin Heidelberg. Source

Dong K.,Beijing Institute of Technology | Sun C.H.,Beijing Institute of Technology | Song J.W.,Qingyang Chemical Industry Corporation | Wei G.X.,Qingyang Chemical Industry Corporation | Pang S.P.,Beijing Institute of Technology
Organic Process Research and Development

Synthesis of 2,6,8,12-tetraacetyl-2,4,6,8,10,12-hexaazaisowurtzitane (TAIW) by catalytic hydrogenolysis of 2,6,8,12-tetraacetyl-4,10-dibenzyl-2,4,6,8,10,12-hexaazaisowurtzitane (TADBIW), a key step for the synthesis of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (HNIW), has been first implemented under continuous flow conditions using the commercially available H-Cube Pro reactor. Several variables (i.e., reaction temperature, flow rate, and pressure) and the stability of the system have been investigated to optimize the operating conditions. The results show that a continuous flow system provides a better yield than a batch system. For instance, the yield is 99% at the optimized conditions, while the best yield from batch reactions is 92%. Continuous flow synthesis of TAIW has potential applications in improving the production technologies of HNIW for its many advantages over batch reactions. © 2014 American Chemical Society. Source

Zhang H.-L.,Qingyang Chemical Industry Corporation | Liu B.-M.,Qingyang Chemical Industry Corporation | Jiao Z.-P.,Qingyang Chemical Industry Corporation | Yu H.-J.,Qingyang Chemical Industry Corporation | Yu Y.-J.,Qingyang Chemical Industry Corporation
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants

In order to study the combustion behavior of the base bleed charge, the burning rate of the base bleed charge with different particle size of AP and distribution was studied by base bleed charge test device. The results show that the major factor affecting the burning rate of the base bleed charge is the total superficial area of AP grains. The smaller of the particle size of AP, the higher of the burining rate. The burning rate of the base bleed charge with different particle size of AP was related to the change rate of the total superficial area of AP grains. Source

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