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Yan K.,Zhejiang University | Zhang Y.-W.,Zhejiang University | Wang Y.-C.,The 718 Research Institute of CSIC | Liu J.-Z.,Zhejiang University | And 2 more authors.
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2013

The lithium perchlorate decomposition process under N2 atmosphere by five different heating rates was analyzed with TG-DSC simultaneous thermal analysis in the temperature range of room temperature to 900°C. Kinetic mechanism of lithium perchlorate decomposition was analyzed by both mass-change rate and energy performance of the chemical reaction process. αTG and αDSC were obtained from TG and DSC data, respectively. It was found that in the same heating-rate αDSC lags behind αTG and the delay increases with the increase in heating-rate. The decomposition process was divided into two-step consecutive reaction which should be fitted with two different mechanism function by single-scan rate method. The multi-scan rate method Friedman was applied to obtaining two sets of activation energies calculated from TG and DSC data respectively. Source


Ma Y.-L.,The 718 Research Institute of CSIC | Chen X.-M.,The 718 Research Institute of CSIC | Huang Q.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2015

To solve the problem of invariable ratio of anion and cation resin for high-tower separation and transportation, the ways of changing the output order and resetting endoscopy and anion resin export position are proposed. The variable ratio of disable anion and cation resin can be separated and transported. The flow rate control and matching are also analyzed in resin transfer process. The best selection is given based on the experiments. ©, 2015, China National Chemical Information Center. All right reserved. Source


Liu T.,The 718 Research Institute of CSIC | Wang S.-B.,The 718 Research Institute of CSIC | Wang Z.-W.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2011

Perfluoro-2-methyl-3-pentanone is the complete fluoride substitute of 2-methyl-3-pentanone, which has the property of preventing burning and has wide application in protecting molten magnesium and extinguishing agents. The main synthetic methods of perfluoro-2-methyl-3-pentanone are introduced and the advantages and disadvantages of above synthetic methods are analyzed. The reaction of pentafluoropropionyl fluoride and hexafluoropropylene is feasible in actual production, and the synthetic method of pentafluoropropionyl fluoride is introduced. The application of perfluoro-2-methyl-3-pentanone in protecting molten magnesium is introduced in detail, and the application of perfluoro-2-methyl-3-pentanone as extinguishing agents and cleaning compositions is briefly introduced. Application experiment indicates that perfluoro-2-methyl-3-pentanone has outstanding flame-retardant effect and has no impact on environment. At last, the development of perfluoro-2-methyl-3-pentanone is prospected. Source


Zheng L.-J.,The 718 Research Institute of CSIC | Jiang Y.-X.,The 718 Research Institute of CSIC | Li J.,The 718 Research Institute of CSIC | Tang J.-K.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The effects of ball/material ratio and milling time on the self-corrosion hydrogen evolution from the aluminum super-corroding alloy prepared by mechanical alloying are studied. The self-corrosion hydrogen evolution of the aluminum based quaternary super-corrosion alloy is determined with the self-made device. The obtained super-corrosion alloy exhibits good self-corrosion hydrogen evolution property when the ball/material ratio and milling time are 5:1 and 60 hours, respectively. Under this condition, the alloy has the fastest hydrogen evolution reaction speed and achieves the maximum corrosion hydrogen evolution quickly in the shortest time. ©, 2015, China National Chemical Information Center. All right reserved. Source


Wu F.-C.,The 718 Research Institute of CSIC | Wang S.-B.,The 718 Research Institute of CSIC | Song F.-C.,The 718 Research Institute of CSIC | Yang X.-K.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2014

The purification process for trifluoromethanesulfonic anhydride is studied. Most of trifluoromethanesulfonic acid (CF3SO3H) can be removed by adding a suitable amount of phosphorus pentoxide. Subsequently, batch vacuum distillation is used to further remove the impurities. The results show that the content of CF3SO3H can be reduced to less than 0.5% via the reaction of CF3SO3H and P2O5. After vacuum batch distillation, the purity of trifluoromethanesulfonic anhydride can reach 99.5%. And the yield of trifluoromethanesulfonic anhydride is 70%. Source

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