共查询到20条相似文献,搜索用时 93 毫秒
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本研究测定了2-乙基己基膦酸单2-乙基己基酯与镧系元素镧、铈、镨、钕、钐、铕、钬、铒、镱、镥的^1H,^13C,^31P核磁共振谱,对HEH/EHP的碳骨架进行了详细归属,并根据^31P NMR谱峰的积分面积,推测了萃合物可能的配位络合比,对铕、镱、镥为6,对铒为5、对钬、钐为4。 相似文献
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应用性能优良的2-乙基己基膦酸单2-乙基己基酯HEH(EHP)萃取剂,首次制备了一系列不同孔结构的萃淋树脂,针对难以分离的镧系元素最难分离的镨,钕,研究了孔结构等与分离效能之关系,探寻出最适宜的孔结构,其比表面积S为209m^2/g,平均孔径为7.7nm孔体积Vg0.401mL/g;HEH(EHP)最适宜量为46.5%,从而达到最佳分离。 相似文献
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稀释剂对二(2-乙基己基)磷酸萃取镧(Ⅲ)的影响 总被引:1,自引:0,他引:1
二(2-乙基己基)磷酸从硝酸介质中对La(Ⅲ)的萃取对不同稀释剂其平衡常数为:正己烷>环己烷>四氯化碳>甲苯>氯仿>甲异丁酮。萃取平衡常数与稀释剂的极性参数S间呈线性关系 相似文献
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萃取剂HDEHP界面性质研究 总被引:2,自引:1,他引:2
萃取剂HDEHP界面性质研究孙国新,杨永会,孙思修,沈静兰(山东大学化学系,济南,250100)关键词界面性质,二-(2-乙基己基)磷酸,萃取剂二-(2-乙基己基)磷酸(HDEHP)是应用十分广泛的萃取剂,其萃取金属的热力学及动力学研究均有大量报道[... 相似文献
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二—(2—乙基己基聚氧化烯烃)琥珀酸双酯磺酸钠的表面活性及应用 总被引:4,自引:0,他引:4
二-(2-乙基己基聚氧化烯烃)琥珀酸双酯磺酸钠的表面活性及应用姚传义吴金川何志敏*(天津大学化学工程研究所天津300072)关键词二-(2-乙基己基聚氧化烯烃)琥珀酸双酯磺酸钠,表面活性,反胶团酶反应,橄榄油水解1997-09-19收稿,1997-1... 相似文献
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合成了稀土铕、镧与吡啶-2,6二甲酸形成的二元配合物及铕与邻菲罗啉和吡啶-2,6二甲酸形成的三元配合物。经元素分析确定该配合物的组成分别为二元:Na3[Eu(DPC)3]·2H2O,Na3[La(DPC)3]·2H2O;三元:NaEu(DPC)2·phen·4H2O。用核磁共振研究了配体与稀土的配位方式,讨论了诱导效应、屏蔽效应及稀土离子的顺磁性对配合物化学位移和NMR谱图的影响。NMR研究表明,三种配合物具有相似的对称结构和相同的化学位移变化规律。吡啶-2,6二甲酸中的羧酸以单齿配位(整个分子为三齿配位),二元配合物中,铕和镧的配位数均为9,三元配合物中,铕的配位数最低为8。 相似文献
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二(2-乙基己基)磷酸对氨基酸的萃取平衡 总被引:3,自引:0,他引:3
二(2-乙基己基)磷酸对氨基酸的萃取平衡曹汉瑾,王德宝,刘沛妍,吴子生,严忠(东北师范大学化学系,长春,130024)关键词氨基酸,二(2-乙基己基)磷酸,萃取平衡,分配比迄今为止,有关氨基酸溶剂萃取的文献报道还不多[1~3].本实验以二(2-乙基己... 相似文献
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《The Journal of chemical thermodynamics》2007,39(6):878-887
The enthalpies of solution of CO2 in aqueous solution of 2-amino-2-methyl-1-propanol (AMP) 15 wt% and 30 wt% were measured at 322.5 K and pressures range from (0.2 to 5) MPa using a flow calorimetric technique. The gas solubilities were simultaneously determined from the calorimetric data. The solubilities were compared to available literature values obtained by direct measurements. The experimental enthalpies of solution were compared to the values derived from the literature vapor liquid equilibrium data. This work provides calorimetric data that will be used later for the development of a thermodynamic model to predict both solubilities and enthalpies of solution of acid gases in aqueous amine solutions. 相似文献
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本文提出一种基于氨基酸盐的CO2复合吸收剂,采用膜接触器 复合溶液耦合技术研究了吸收CO2的性能,并与单一氨基酸盐溶液吸收性能进行了比较,讨论了气液流速等因素对气液出口CO2浓度、捕集效率和总传质系数的影响,开发了一个阻力层模型预测膜接触器的总传质系数。结果表明:复合溶液的性能明显好于单一氨基酸盐溶液;与单一溶液比较,使用复合溶液,气相出口CO2浓度较低,液相出口CO2浓度较高,捕集效率也较高;复合溶液的总传质系数明显高于单一溶液。可以证实,在膜吸收过程中氨基酸盐基复合溶液是一高效的CO2吸收剂。模型的预测值符合实验值。 相似文献
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Xinyu Chen Kenji Okitsu Norimichi Takenaka Hiroshi Bandow 《Analytical sciences》2004,20(12):1759-1762
The reaction of NO2 and NaOH aqueous solution at room temperature was studied for elucidating the behavior of gaseous NO2 in an alkaline solution. Experimental runs related to NO2 absorption have been carried out in various pH solutions. The nitrite and nitrate ions formed in these absorption solutions were quantitatively analyzed. In the case of pH 5-12, both of the nitrite and nitrate ions were formed simultaneously. On the other hand, only the nitrite ion was formed when the pH of the absorption solution was higher than 13. In this paper, a new reaction mechanism was proposed to explain the selective formation of nitrite ion in the 10 M alkaline solution. In order to confirm the new reaction mechanism, H2(18)O was used as part of the absorption solution for detecting oxygen gas production. The amounts of reaction products: (18)O(18)O, (18)O(16)O and (16)O(16)O, were quantitatively determined. It was confirmed that the new reaction proceeds mainly in the 10 M alkaline solution. 相似文献
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用NaNO2/FeSO4·7H2O体系替代TEMPO在有机相中合成分子量可控的聚苯乙烯大分子引发剂,引发苯乙烯聚合及酯类单体[如甲基丙烯酸甲酯(MMA)、丙烯酸甲酯(MA)和丙烯酸乙酯(EA)等]聚合,得到两嵌段共聚物.其多分散性指数小于1.5,体现了可控聚合的特征.用大分子引发剂引发苯乙烯进行活性链增长,单体的转化率较高.嵌段共聚物的实测分子量与理论分子量相近,结构经1HNMR和GPC表征.NaNO2/FeSO4·7H2O体系在纯有机相中的应用降低了活性聚合的成本,有利于工业化应用. 相似文献
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Huang PX Wu F Zhu BL Gao XP Zhu HY Yan TY Huang WP Wu SH Song DY 《The journal of physical chemistry. B》2005,109(41):19169-19174
The formation mechanism of uniform CeO2 structure at the nanometer scale via a wet-chemical reaction is of great interest in fundamental study as well as a variety of applications. In this work, large-scale well-crystallized CeO2 nanorods with uniform diameters in the range of 20-30 nm and lengths up to tens of micrometers are first synthesized through a hydrothermal synthetic route in 5 M KOH solution at 180 degrees C for 45 h without any templates and surfactants. The nanorod formation involves dehydration of CeO2 nanoparticles and orientation growth along the 110 direction in KOH solution. Subsequently, gold nanoparticles with crystallite sizes between 10 and 20 nm are loaded on the surface of CeO2 nanorods using HAuCl4 solution as the gold source and NaBH4 solution as a reducing agent. The synthesized Au/CeO2 nanorods demonstrate a higher catalytic activity in CO oxidation than the pure CeO2 nanorods. 相似文献
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Weatherhead-Kloster RA Selby HD Miller Iii WB Mash EA 《The Journal of organic chemistry》2005,70(22):8693-8702
[structure: see text] The title 1,4-piperazine-2,5-dione was synthesized in 23% yield over six steps from ethyl 2-amino-4,7-dimethoxyindan-2-carboxylate. Crystallization by slow diffusion of ether into a chloroform solution and by slow evaporation of an ethanol-chloroform-benzene solution produced polymorphic crystalline forms as determined by single-crystal X-ray analysis. The polymorphs exhibited different hydrogen-bonding networks. The association of this piperazinedione in solution was studied using mass spectrometric and nuclear magnetic resonance spectroscopic techniques. The MS and NMR data were interpreted using the solid-state structures as models for solution aggregation. Association constants extracted from the NMR data are in line with those of other cyclic cis amides in chloroform solvent. 相似文献
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运用N2O-C2H2火焰原子吸收光谱法测定电化学浸渍液中的钴含量。通过试验确定了共振线、燃烧器高度、灯电流、酸性介质、火焰等实验条件。用该方法对样品中钴含量进行分析,测定结果的相对标准偏差小于1.0%(n=6),加标回收率为97.3%~98.8%。该方法适用于电化学浸渍液中钴含量的控制分析和样品系统分析。 相似文献
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The reaction of copper sulfate, boric acid, and sodium hydroxide in an aqueous solution was studied in relation to the molar ratio and concentration of components, solution pH, temperature, and reaction duration. The conditions under which tricuprotetraborate hexahydrate 3CuO · 2B2O3 · 6H2O is formed were determined. 相似文献
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An atrazine photodegradation study carried out by a Q-Panel suntest apparatus is reported in this work. H2O2/TiO2 photocatalyzed reaction yield and parameters (time, irradiance, temperature, H2O2 (40%) volume, TiO2 amount) were exactly determined relating to the used atrazine concentration. An experimental kinetic study was performed to establish the reaction order in fixed conditions. Using a biosensor method, 10(-4) M Atrazine solution toxicity and final photocatalytic reaction solution toxicity were quantitatively determined. A consistent toxicity decrease was observed on passing from the analyte to the products of the photocatalytic reaction. An analogous photolytic reaction carried out in absence of TiO2, but in the same experimental conditions of time, irradiance, temperature and H2O2 volume, brings to a toxicity increase. 相似文献