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Qian H.,Nanjing University of Science and Technology | Wang Y.,China Explosive Materials Trade Association | Liu D.,Nanjing University of Science and Technology | Lv C.,Jiangsu Pharmaceutical Intermediate Research Center
Letters in Organic Chemistry | Year: 2014

This page isvestigated that bismuth triflate catalysed the nitration of a range of simple aromatic compounds in good to excellent yields at 0-30 °C within 2 h using N2O5 and the catalyst can be recycled without apparent loss of activity. Mechanistic insights demonstrate that triflic acid is generated and that, at least, when two competing catalytic cycles are operating at the same time: a rapid one involving triflic acid and a slower one involving the bismuth triflate. © 2014 Bentham Science Publishers. Source


Qian H.,Nanjing University of Science and Technology | Wang Y.,China Explosive Materials Trade Association | Liu D.,Nanjing University of Science and Technology
Industrial and Engineering Chemistry Research | Year: 2013

Claisen-Schmidt condensation of 2′-hydroxyacetophenone with benzaldehyde using easily recovered and efficiently reused ionic liquids (ILs) results 2′-hydroxychalcone in 89% yield under ultrasound irradiation. Compared to classical methods, the advantages of this method are mild conditions, shorter reaction time, and high yield. This ''green'' method has been applied to the synthesis of several substituted 2′-hydroxychalcones achieving, in all cases, excellent activities and selectivities. © 2013 American Chemical Society. Source


Zheng W.-F.,Nanjing University of Science and Technology | Wang Y.,China Explosive Materials Trade Association | Li Q.-H.,Nanjing University of Science and Technology | Yin J.-G.,WuZhou Engineering Design and Research Institute | And 2 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2014

To study the forming regularity of combustion residue caused by the deviation of web size of gun propellant, the web size of oblate propellant was measured by a spiral micrometer and the distribution rule of web size was obtained by statistical analysis. Using propellant form function of composite charge, the distribution rule of web size was converted to propellant form function, and then the relationship between distribution of web size and combustion residue was investigated based on the classical interior ballistic models. Results show that the deviation of web size exists in gun propellant, and the distribution rule of web size conforms to normal probability function. The propellant with large web size can not be burned out in chamber and form combustion residue. The deviation value of web size of oblate propellant is 0.10 mm, and 0.2% of the propellant charge will become combustion residue when firing. When the deviation value of web size over 0.02 mm or expected value greater than or equal to 0.29 mm, part of the propellant charge will change to combustion residue, and the amounts of residue increases with the increasing of expected value or deviation of web size of propellant. Source


Lin X.-Y.,Nanjing University of Science and Technology | Wang Y.,China Explosive Materials Trade Association | Liu Y.-J.,Nanjing University of Science and Technology | Yin J.-G.,WuZhou Engineering Design and Research Institute | Pan R.-M.,Nanjing University of Science and Technology
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2011

The constant-volume combustion characteristics was studied by a closed vessel test. The results show that the porosity increases with decreasing the bulking density of sample. The pressure rises faster with decreasing the bulking density. The relation of apparent burning rate coefficient and the porosity reveals in power function. With decreasing the bulking density, the peak value of dynamic vivacity increases, showing significant progressing characteristics. Source

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