Entity

Time filter

Source Type


Jin F.,Institute of Chemical Technology | Liu B.,Shanxi North Xingan Chemical Industry Co. | Li X.,Institute of Chemical Technology | Li B.,Institute of Chemical Technology | Yang H.,Institute of Chemical Technology
Acta Petrologica Sinica | Year: 2013

Ca(Ac)2/ZnO was prepared by impregnation and with which CaO/ZnO was made by high temperature calcination. Effects of impregnating solution mass fraction, calcination temperature and calcination time on the catalytic activity of CaO/ZnO were investigated through orthogonal experiments. The transesterification of castor oil with methanol was studied by using CaO/ZnO as a catalyst, prepared under the optimal conditions. Ca(Ac)2/ZnO) and CaO/ZnO prepared at optimal conditions were characterized by TG-DTG, XRD, BET. The results showed that the suitable preparation conditions of CaO/ZnO was impregnating solution mass fraction 0.2, calcination temperature 973 K and calcination time 3 h. Under the conditions of alcohol/oil molar ratio 9, catalyst/oil mass ratio 0.03, reaction temperature 338 K and reaction time 4.5 h, castor oil conversion could reach 99.7%. There were two distinct weightless peaks at 690 K and 1020 K in TG-DTG curves of Ca (Ac)2/ZnO. CaO/ZnO and ZnO had the same crystalline structure, displaying CaO being utterly dispersed on ZnO. The surface area of CaO/ZnO was 6.10 m2g and its average pore radius was 2.59 nm. Source


Deng H.-Y.,Nanjing University of Science and Technology | Feng F.,Nanjing University of Science and Technology | Wu X.-S.,Nanjing University of Science and Technology | Yu X.-F.,Nanjing University of Science and Technology | Zuo Y.-Y.,Shanxi North Xingan Chemical Industry Co.
Binggong Xuebao/Acta Armamentarii | Year: 2016

In order to study the effect of eccentric impact of jet on the impinging atomization of gel propellant, a relative experimental system is established, and a gel propellant as well as a simulant are prepared. Jet behavior, impinging liquid sheet and droplet size distribution at different eccentricities are measured. Spray incline angle is deduced theoretically and compared to the experimental results under eccentric impingement. The results indicate that the disturbances on jets are strengthened with increase in jet velocity. However, the deformations of the jets near injectors are all very small at different jet velocities since the disturbance is limited. The development and breakup of liquid sheet are basically the same under different eccentricities. While the eccentricity exceeds 1.5/6, two darker regions with a certain angle appear at the impinging point, resulting in the enhancement of flux nonsymmetry. As the eccentricity is improved, the spray incline angle enlarges and is less than the theoretical result. The eccentricity has a little influence on the droplet size distribution of impinging atomization, but Sauter mean diameter (SMD) with eccentricity is always lower than that without eccentricity. And SMD reaches the smallest when the eccentricity equals to 0.5/6. © 2016, Editorial Board of Acta Armamentarii. All right reserved. Source


Wang W.-J.,Beijing Institute of Technology | Cui X.-Y.,Beijing Institute of Technology | Zhu H.-D.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Zuo Y.-Y.,Shanxi North Xingan Chemical Industry Co.
Binggong Xuebao/Acta Armamentarii | Year: 2016

Cellulose nano-fibers (CNFs) are prepared by TEMPO-mediated oxidation combined with homogenizing mechanical treatment. The carboxyl groups on the surface of CNFs are removed by an alkalization process. Then CNFs are chemically modified by a mixture of nitric acid and dichloromethane to obtain nitrified CNF (NCNF). NCNFs could readily suspend and well disperse in acetone. The structure and properties of NCNFs are examined using Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and transmission electron microscopy (TEM). The nano-nitrocellulose composite films with NCNF as reinforcment are prepared by a casting/evaporation technique. The tensile properties of the nanocomposite films are tested. The results show that the tensile strength, Young's modulus, and elongation at break of the nanocomposite films increase simultaneously in comparison with that of neat NC. The influence of cellulose nanowhiskers (CNWs) and CNFs on the tensile properties of nanocomposite films is studied. As reinforcement, CNFs demonstrate higher efficiency compared to CNWs because of their larger aspect ratio. © 2016, China Ordnance Society. All right reserved. Source


Cheng S.-C.,Nanjing University of Science and Technology | Lin X.-Y.,Nanjing University of Science and Technology | Li Y.,Nanjing University of Science and Technology | Jian G.-X.,Shanxi North Xingan Chemical Industry Co.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2016

To establish a rapid quantitative test method of blending uniformity of modified double-base propellant components, a near infrared (NIR) spectrometer was adopted to test the double-base absorbed sample and to quantitatively analyze the contents of each component and their dispersion uniformity. Firstly, based on sample testing, the quantitative calibration models of the components: nitrocellulose(NC), nitroglycerine(NG), cyclotrimethylenetrinitramine(RDX) and water were established and the correlation coefficients of each component model are more than 0.98, and the mean values of components' absolute errors obtained by internal validation are less than 2%. Then NIR spectra of samples in the blending process were continually collected. The component contents of sample were predicted by the established models. The absolute errors of the predicted results and the actual values are less than 2%. The blending uniformity of sample was analyzed by coefficient of variation (CV) method for the contents of each component and and moving block standard deviation (MBSD) method for the original spectra of samples. The CV values of each component are less than 1.5%, while MBSD value of the sample is less than 0.001. Two kinds of evaluation indexes have reached steady state after 2.5 min, indicating that sample components had uniform distribution. Results show that it is feasible to use near infrared (NIR) spectroscopy to test the blending uniformity of modified double-base propellant components. © 2016, Editorial Board of Chinese Chinese Journal of Energetic Materials. All right reserved. Source


Hao G.-Z.,Nanjing University of Science and Technology | Liu J.,Nanjing University of Science and Technology | Hou X.-T.,Shanxi North Xingan Chemical Industry Co. | Gao H.,Nanjing University of Science and Technology | And 4 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2015

Nano β-Cu(copper β-resorcylate) were prepared via a facile wet mechanical grinding method, and were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). Meanwhile, the catalytic properties of nano β-Cu were investigated. Results reveal that the nano β-Cu is semi-spherical and homogeneous with a fairly uniform size of 100 nm. DSC results show that the nano β-Cu has significant catalytic effects on ultra-fine AP with different particle size. The peak temperature of decomposition in the high temperature range for 6 μm and 1 μm AP decreases to 373.1℃ and 351.2℃, respectively, and the apparent decomposition heat increases to 1529 J·g-1 and 1513 J·g-1, respectively. And the reaction rate constant increases about 10 times. Compared with 6 μm AP, nano β-Cu makes the peak temperature of the high temperature decomposition of 1 μm AP obviously lower, and the reaction rate constant much higher, indicating nano β-Cu exhibits much better catalytic efficiency for accelerating the thermal decomposition of 1 μm AP. ©, 2015, Editorial Board of Chinese Chinese Journal of Energetic Materials. All right reserved. Source

Discover hidden collaborations