Papers by Keyword: Ethylenediamine

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Authors: Yue Lun Wang, Bo Hou, De Bao Li, Jian Gang Chen, Yu Han Sun
Abstract: The influence of ethylenediamine (en)/Co molar ratio on the preparation of Co/SiO2 catalysts was studied. The decomposition of these Co-en species resulted in the formation of small cobalt nanoparticles. The highly dispersed catalysts led to lower FT activity due to an increase of cobalt-silica interaction except Co(en)2/SiO2 catalyst. Meanwhile, higher selectivity for light hydrocarbons was observed, which was ascribed that smaller cobalt particles containing active sites depressed the chain growth.
Authors: Jia Ming Zhang, Chun Yuan Ma
Abstract: The decompositon of ethylenediamine (EDA) in supercritical water oxidation (SCWO) were investigated. The experiments were conducted in an isothermal and vertical continuous plug-flow reactor at 375-500°C, 25 MPa, residence time of 2-80 s, and excess oxygen of 150%. It was found that yields of nitrous oxide, nitrogen, and the denitrification rate increased as temperature and residence time increased. The kinetics for denitrification of EDA was described by a rate law involving first order reaction. The results calculated from kinetics equation reconciled the experimental data.
Authors: Wen Pan, Ning Hui Wang, Guo Feng Li, Gui Ling Ning
Abstract: The novelty of the current work lies in the simple synthesis of a new class of monodisperse, luminescent silica spheres produced upon calcination of hybrid amine-functionalized silica spheres which can known the role of ethylenediamine (en) on the morphology and luminescence properties of the resultant silica spheres.
Authors: Hong Zhu
Abstract: Novel sterically hindered chain extender, 2-acetyl-ethylenediamine (MEDA) was synthesized by acetylating of ethylenediamine(EDA) with glacial acetic acid in presence of phosphoric acid, in order to reduce high reactivity of synthesizing polyurea and study its kinetics equation. Its chemical structure was confirmed through FTIR and 1H-NMR analysis. Polyureas were synthesized by reaction of 4,4’-dipheSuperscript textnylmethane diisocyanate(MDI), amine terminated polyether(D-2000) with different chain extenders. The reaction kinetics of polyurea curing process was studied by FTIR. The results showed that extending reaction with MEDA was second order kinetic mechanism, its apparent activation energy was 36.81 kJ•mol-1.
Authors: Si Qian Hu, Hai Ping Wang, Yu Hong Chen, Pei Liu
Abstract: Magnetic microspheres with chitosan (CTS) and nano-iron (NI) as materials were synthesized by reverse suspension polymerization technology, and then modified with ethylenediamine (EDA). The average amine content of as-prepared magnetic microspheres (CTS-NI-MM-EDA) is 5.22 mmol/g, and the iron content is 23.77%.The adsorption experiments indicated that the adsorption rate of CTS-NI-MM-EDA for methyl orange is in the range of 62%-86% when the concentration of methyl orange is less than 250 mg/L, and the saturated adsorption quantity is 1651mg/g at 25 oC and pH 5.5.
Authors: Qiang Qiang Liao, Yi Jiu Li, Bo Xiang
Abstract: An aminated D-glucose [N,N'-di-b-D-glucopyranosyl ethylenediamine] was prepared and thoroughly characterized by FT-IR, ESI-MS, NMR spectra and elemental analysis. Compared with D-glucose, the FT-IR spectrum of the aminated glucose showed a moderate peak at 1629~1608 cm-1 which was attributed to dNH vibration, suggesting glucose reacted to ethylenediamine (en). The ESI-MS spectrum exhibited a strong peak at m/z 383.2, which was assigned to the species [C14H27O10N2]-. The 1H-NMR spectrum of the aminated D-glucose demonstrated the signal of the C1 proton and the amino proton at 4.82~4.79ppm, illustrating the amino of ethylenediamine was substituted for the hydroxy group of C1. As for UV spectra, the aminated glucose hadn’t absorbance in the ultraviolet region while its complex with Cu2+ had obvious absorption peak at about 236nm. The complex ratio of the aminated glucose to Cu2+ was close to 1:1 and the stability constant of its Cu2+ complex was 6.8*107 in 0.01mol×L-1 borax buffer solution.
Authors: Qing Lv, Cai Xia Li, Dan Yu Jiang, Qiang Li
Abstract: The intercalation of ethylenediamine (en) into SnS2 was synthesised by hydrothermal reaction at the temperature of 180 °C.And then dispersed the intercalation compounds in N, N-dimethylformamide (DMF) by stirring 48h,getting a light yellow sol ,with the nature of uniform ,transparent and stable.Analysised the structural of the product by means of X-ray powder diffraction (XRD) .The morphology of sol was characterized by using of transmission electron microscopy (TEM).The UV-Vis spectrophotometer was utilized for the absorbance of the colloidal.The results show that en has been successfully inserted into the layer of tin disulphide,and the target products is of high purity and good crystal.The sol is of high stability and homogeneity, and have the strongest absorption at the Wavelength of 270nm.
Authors: Moon Hee Choi, Yoon Bok Lee, In Bae Kim, Young Seok Kim, Young Mok Rhyim, Jin Chun Kim, Yang Do Kim
Abstract: Cadmium selenide (CdSe) of hollow sphere with 30-50nm in diameter have been prepared form the mixed solution of cadmium chloride (CdCl2), sodium selenosulfate(Na2SeSO3) and ethylenediamine (H2NCH2CH2NH2) at room temperature. The hollow sphere of CdSe was characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The molar ratio of EDA to Cd2+ ions in this system was important factor on controlled synthesis in the self-encapsulated morphology. Based on the observation on morphological difference with molar ratio of EDA to Cd2+ ion, the possible mechanism for the formation of CdSe hollow sphere was discussed.
Authors: N.A. Bykovsky, L.N. Puchkova, N.N. Fanakova
Abstract: The processing of the light fraction formed during the separation of amines for components by rectification is investigated. The light fraction which is an aqueous solution with about 1% of ethylenediamine and 2% of ammonia is treated in an electrolyzer with ion-exchange membranes. It is shown that a concentrated product containing about 118 g/l of ethylenediamine, about 106 g/l of ammonia and purified water can be obtained in this case. The concentrated product can be used at the initial stage of amines production.
Authors: Tao Tao Qiang, Min Luo, Qiao Qiao Bu, Xue Chuan Wang
Abstract: The aminated collagen fiber (ACF) was prepared by modifying collagen fiber (CF) with ethylenediamine and cynuric chloride as crosslinking agent. The appropriate modification conditions were optimized by single factor experiment method. The reaction molar ratio of CNC and -NH2 was 1.4, the reaction time of ice water bath was 3h, the temperature of the second phase was 45°C and the reaction time was 4h, the temperature of the third phase was 70°C and the reaction time was 3h. The content of amino of collagen fiber and aminated were measured by the method of salicylaldehyde. The structures of collagen fiber and aminated collagen fiber were characterized by SEM and FTIR respectively. The adsorption capacities and the content of amino of CF and ACF were observed by dealing with acidic black dyeing and sturgeon skin dyeing wastewater.
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