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Ye W.,Northwest University, China | Zhao B.,Northwest University, China | Gao H.,Northwest University, China | Huang J.,Xian North Huian Chemical Industry Co. | Zhang X.,Northwest University, China
Journal of Porous Materials | Year: 2016

Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N2-adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m2 g−1 and 0.114 cm3 g−1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm. © 2015, Springer Science+Business Media New York. Source


Zhang X.-D.,Beijing Institute of Technology | Li J.-M.,Beijing Institute of Technology | Yang R.-J.,Beijing Institute of Technology | Zhu L.-X.,Xian North Huian Chemical Industry Co. | Zhao X.-Q.,Beijing Institute of Technology
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2011

For improving the hygroscopicity and surface polarity of phase-stabilized ammonium nitrate (PSAN), ethylenediamine, diethylamine and triethylamine, which represent primary amines, secondary amines and tertiary amines, were selected to react with the surface of PSAN particle to prepare amines reactively coated PSAN. The chemical reaction between amines and AN were confirmed by FTIR. The coating effects were characterized by rate of moisture absorption, contact angles and propellants tensile test. It is shown that the hygroscopicity and surface polarity of PSAN reactively coated by diethylamine get the best effects compared with the others, the rate of moisture absorption decline by 60.5% and 63.6% respectively in the atmosphere of relative humidity 75.3% and 92.5% in 8 h, and the polar component of surface free energy decline by about 87%, and the nonpolar component increase by about 145%. Using these reactively coated PSAN particle in the BAMO-THF/PSAN propellants, it is found that the propellants using the PSAN coated by ethylenediamine have the best mechanical properties, the maximum stress (σm) can be obtained at 0.2% coating mass of ethylenediamine, the maximum stress increased by about 46%, and the elongation (εm) increased by about 83%. Source


Zhang X.-D.,Beijing Institute of Technology | Li J.-M.,Beijing Institute of Technology | Yang R.-J.,Beijing Institute of Technology | Zhu L.-X.,Xian North Huian Chemical Industry Co. | Zhao X.-Q.,Beijing Institute of Technology
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2010

In order to improve the mechanical properties of the propellants containing phase-stabilized ammonium nitrate(PSAN), ethylenediamine was used to react with the surface of PSAN particle to prepare ethylenediamine reactively coated PSAN. The chemical reaction between ethylenediamine and AN was confirmed by FTIR and the coating effect was characterized by hygroscopicity and contact angles test. The results show that the surface polarity of coated PSAN particle decreases obviously and the hygroscopicity decreases a certain extent in contrast with PSAN particle. When the coated PSAN particle was used in the BAMO-THF/PSAN propellants, the best improvements of the mechanical properties of the propellants are at coating mass of 0. 2%, the maximum stress (δm) increases by about 46%, and the elongation (εm) increases by about 83%. Source


Wang L.,Xian North Huian Chemical Industry Co. | Hu J.-Z.,Refining and Chemical Co. | Hu J.-Z.,Northwest University, China | He F.,Xian North Huian Chemical Industry Co. | Dan Y.,Northwest University, China
Petrochemical Equipment | Year: 2011

The seal principle, structural characteristics, failure reasons, and economy of seal structures used in heat exchangers, subject to high temperature and high pressure in hydrogenation unit, were analyzed and discussed according to the operation conditions of hydrogenation unit. The results of analysis and comparison showed that preferred Ω ring seal, diaphragm seals, followed by the selection thread locking ring seal for use, octagonal metallic ring cushion seal is not recommended. Source


Li H.-Q.,Northwest University, China | Dan Y.,Northwest University, China | Wang L.,Xian North Huian Chemical Industry Co. | He F.,Xian North Huian Chemical Industry Co.
Petrochemical Equipment | Year: 2011

To calculate stresses and analyze intensity of tangential nozzle area, the numerical model was established with finite element theory and method, and the detailed stress fields were obtained by ANSYS soft. On this basis, the tangential nozzle area stresses were classified and stress strength was studied, according to the principle of design by analysis. Stress calculation results indicate that there were high local stresses in tangential nozzle area. Strength analysis results show that the tangential nozzle area intensity met the requirements. Source

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