A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which c...A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which can be shaped charge antitank weapons or be used energetic carrier for higher melting meaterial such as HMX and the like.ADNAZ was synthesized by a five-steps reaction,using nitromethane,paraformaldehyde and tert-butylamine etc.as starting materials,with overall yield of 42.8%.Some factors affecting yield of ADNAZ was also discussed.The structures of intermediates and ADNAZ were confirmed by IR,HNMR,CNMR and MS.展开更多
The selective oxidation of n-butane to maleic anhydride (MA) on a vanadium-phosphorus oxide (VPO)catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transientresponse techn...The selective oxidation of n-butane to maleic anhydride (MA) on a vanadium-phosphorus oxide (VPO)catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transientresponse technique. The reaction intermediates, butene and furan, were found in the reaction effluent under nearindustrial feed condition (3% butane+15%O2), while dihydrofuran was detected at high butane concentration (12%butane, 5%O2). Some intermediates of MA decomposition were also identified. Detection of these intermediatesshows that the vanadium phosphorus oxides are able to dehydrogenate butane to butene, and butene further to formMA. Based on these observations, a modified scheme of reaction network is proposed. The transient experimentsshow that butane in the gas phase may directly react with oxygen both on the surface and from the metal oxidelattice, without a proceeding adsorption step. Gas phase oxygen can be adsorbed and transformed to surface latticeoxygen but it can not participate in selective oxidation. Adsorbed oxygen leads to deep oxidation, while latticeoxygen leads to selective oxidation.展开更多
C4 components are useful in industry and should be separated as individuals. A new process was proposed to separate them by extractive distillation, with the advantages of low equipment investment, energy consumption...C4 components are useful in industry and should be separated as individuals. A new process was proposed to separate them by extractive distillation, with the advantages of low equipment investment, energy consumption and liquid load in the columns. One principle to improve the extractive distillation process was put forward. Moreover, the analysis of operation state of the new process was done. There were eight operation states found for the whole process, but only one operation state was desirable. This work provides a way to effectively separate C4 mixtures and helps the reasonable utilization of C4 resource.展开更多
文摘A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which can be shaped charge antitank weapons or be used energetic carrier for higher melting meaterial such as HMX and the like.ADNAZ was synthesized by a five-steps reaction,using nitromethane,paraformaldehyde and tert-butylamine etc.as starting materials,with overall yield of 42.8%.Some factors affecting yield of ADNAZ was also discussed.The structures of intermediates and ADNAZ were confirmed by IR,HNMR,CNMR and MS.
基金Supported by the National Natural Science Foundation of China (No. 29792073-3).
文摘The selective oxidation of n-butane to maleic anhydride (MA) on a vanadium-phosphorus oxide (VPO)catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transientresponse technique. The reaction intermediates, butene and furan, were found in the reaction effluent under nearindustrial feed condition (3% butane+15%O2), while dihydrofuran was detected at high butane concentration (12%butane, 5%O2). Some intermediates of MA decomposition were also identified. Detection of these intermediatesshows that the vanadium phosphorus oxides are able to dehydrogenate butane to butene, and butene further to formMA. Based on these observations, a modified scheme of reaction network is proposed. The transient experimentsshow that butane in the gas phase may directly react with oxygen both on the surface and from the metal oxidelattice, without a proceeding adsorption step. Gas phase oxygen can be adsorbed and transformed to surface latticeoxygen but it can not participate in selective oxidation. Adsorbed oxygen leads to deep oxidation, while latticeoxygen leads to selective oxidation.
文摘C4 components are useful in industry and should be separated as individuals. A new process was proposed to separate them by extractive distillation, with the advantages of low equipment investment, energy consumption and liquid load in the columns. One principle to improve the extractive distillation process was put forward. Moreover, the analysis of operation state of the new process was done. There were eight operation states found for the whole process, but only one operation state was desirable. This work provides a way to effectively separate C4 mixtures and helps the reasonable utilization of C4 resource.
