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二氯乙烷
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  “2-二氯乙烷”译为未确定词的双语例句
    EXTRACTION OF PICRIC ACID WITH CROWN ETHER-1, 2-DICHLOROETHANE
    冠醚-1,2-二氯乙烷对苦味酸的萃取
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    EXTRACTION OF LIGHT RARE EARTH IN PICRIC ACID MEDIUM WITH CROWN ETHERS-1, 2-DICHLOROETHANE
    冠醚-1,2-二氯乙烷在苦味酸体系中对轻希土元素的萃取
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    Purification and application of the laser reagent 1,2-dichloroethane
    激光试剂1,2-二氯乙烷的提纯与应用
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    Studies on Transfer Mechanism of Chloroquine at the Aqueous 1,2-Dichloroethane Interface
    氯喹药物在水/1,2-二氯乙烷界面上的传输机理研究
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    INFRARED SPECTRA STUDIES OF BUTANOLS IN CARBON TETRACHLORIDE, n-HEPTANE, BENZENE AND 1,2-DICHLOROETHANE
    异构丁醇在四氯化碳、正庚烷、苯和1,2-二氯乙烷中的红外光谱研究
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On studying the Kinetics of ethylene oxidation reaction with feed containing 4.0-4.4% ethylene and 6.0~6.7% oxygen at 190—230℃ and 10 atm on the YL—016 silver containing catalyst mentioned in the preceding paper, the following reaction scheme was proposed. and the individual rate equations with their kinetic parameters was determined. The effect of small amount of dichloethane in the feed was examined and the suitability of the proposed equations to the feed containing 7.7% carbon dioxide was also confirmed....

On studying the Kinetics of ethylene oxidation reaction with feed containing 4.0-4.4% ethylene and 6.0~6.7% oxygen at 190—230℃ and 10 atm on the YL—016 silver containing catalyst mentioned in the preceding paper, the following reaction scheme was proposed. and the individual rate equations with their kinetic parameters was determined. The effect of small amount of dichloethane in the feed was examined and the suitability of the proposed equations to the feed containing 7.7% carbon dioxide was also confirmed. The results of this study may be used for the scale-up of chemical reactors.

应用上报所用的YL-016型银催化剂,研究了在190°~230℃和10atm下乙烯(4.0~4.4%),空气(O_26.0~6.7%)在该催化剂上的反应动力学,提出了该反应的化学模型为求得了各个反应的动力学速度式及有关动力学参数。本试验还实测了当反应气内含有微量的二氯乙烷时对该反应的影响,验证了所提出的速度式在原料气中含有7.7%二氧化碳时的适用性,本研究结果可供反应器数模放大之用。

A butadiene-styrene copolymer of low styrene content (5%, Wt.) has been characterized by 1H NMR to have only isolated styrene units on the chain. The fluorescence spectra of the sample in dilute solutions of a good solvent (dichloroethane) at 25-26℃ showed monomer fluorescence only. Changes of the. fluorescence spectra from a good solvent to poor solvents (dichloroethane-methanol mixture), and from dilute to concentrated solutions up to the solid film confirmed that excimer formation exists between nonadjacent...

A butadiene-styrene copolymer of low styrene content (5%, Wt.) has been characterized by 1H NMR to have only isolated styrene units on the chain. The fluorescence spectra of the sample in dilute solutions of a good solvent (dichloroethane) at 25-26℃ showed monomer fluorescence only. Changes of the. fluorescence spectra from a good solvent to poor solvents (dichloroethane-methanol mixture), and from dilute to concentrated solutions up to the solid film confirmed that excimer formation exists between nonadjacent chromophores in the chain and between interchain chromophores. Com-parision of the spectra obtained from a dilute 8-solution and solid film gave us an estimation of the relative importance of the intrachain excimer interaction and interchain excimer interaction in the solid sample studied. These results may help us to visualize the interpenetration and entanglement of polymer coils during transition from a dilute solution to a concentrated one and to a solid polymer.

本文报导一种低苯乙烯含量(5%,Wt.)的丁二烯-苯乙烯共聚物,经~1H NMR证明其分子链上不存在相邻苯乙烯单元。荧光光谱结果表明,它在良溶剂(二氯乙烷)的稀溶液状态下只呈现单分子荧光。从良溶剂-θ溶剂(二氯乙烷-甲醇体系)及稀溶液-浓溶液-固体之荧光光谱的变化,证明形成了链内非近邻生色团之间和链间生色团之间的激基缔合物(Excimer)。从固体与θ溶剂的激基缔合物荧光的比较,还可区分链内非近邻和链间苯环形成激基缔合物对荧光强度的贡献。这一结果对阐明高分子链内非近邻和链间激基缔合作用提供了新的证据,并有助于了解高聚物本体中相互穿透、相互缠结的无规线团的形态。

The extraction of Neptunium (Ⅳ) by ten crown ethers with various substituting groups from nitric acid solution have been investigated. The ten crown ethers studied are: Octamethylperhydrocyclotetrafurfurylene, Benzo-15-crown-5, 4-t-butyl-benzo-15-crown-5, 16-crab-5, 18-crown-6, Dibenzo-18-crown-6, Dicyclohexo-18-crown-6, Dibenzo-24-crown-8, Dibenzo-30-crown-10 and Cryptand-222.Experimental results show that there exists some relation between extraction of Neptunium (Ⅳ) with the structure of corresponding complexes...

The extraction of Neptunium (Ⅳ) by ten crown ethers with various substituting groups from nitric acid solution have been investigated. The ten crown ethers studied are: Octamethylperhydrocyclotetrafurfurylene, Benzo-15-crown-5, 4-t-butyl-benzo-15-crown-5, 16-crab-5, 18-crown-6, Dibenzo-18-crown-6, Dicyclohexo-18-crown-6, Dibenzo-24-crown-8, Dibenzo-30-crown-10 and Cryptand-222.Experimental results show that there exists some relation between extraction of Neptunium (Ⅳ) with the structure of corresponding complexes in the organic phase, structure of various substituting groups on the rings of macro cyclic polyethers and the concentration of nitric acid in aqueous phase.Among the ten crown ethers, Dicyclohexyl-18-crown-6 has excellent performance. Effects of several solvents were also studied: Benzene, Toluene, o-Xylene, 1,3,5-trime-thylbenzene, Nitrobenzene, n-Hexane, Kerosene, Cyclohexane, Chloroform, 1,2-Dichloro-ethane and Carbon tetrachloride. It is noted that good extraction of Neptunium (Ⅳ) with crown ethers may be effected by using the solvent of high dielectric constant as diluent, such as 1,2-Dichloroethane and Nitrobenzene. The distribution coefficient of Neptunium (IV) by Dicyclohexyl-18-crown-6/1,2-dichloroethane from nitric acid system were studied as a function of the diluent, concentration of crown ethers, acidity in aqueous phase, effects of salting-out agent (NH4+, Na+, Ca2+, Al3+) and so on.The distribution coefficients of 14 radionuclides [144Ce (Ⅳ), 134Cs, 22Na,140Ba, 152Eu, 95Zr-95Nb, 106Ru, 45Ca,90Sr-90Y, 233U (Ⅳ), 232Th (Ⅳ), 237Np(Ⅳ)] have also been determined at 18 ± 1℃, and the separation coefficients of Neptunium (Ⅳ) and correspoding radionuclides have been calculated.It seems that DicyclohexyI-18-crown-6 could be a useful reagent for separating Neptunium (Ⅳ) from other radionuclides in the liquid-liquid extraction method.

本文研究了硝酸体系中十种不同结构的冠醚在不同硝酸浓度下对镎(Ⅳ)的萃取,实验结果表明,镎(Ⅳ)的萃取与有机相中萃合物的形式、多醚环上取代基的结构以及水相硝酸浓度等因素有很大关系,其中以二环已基-18-冠-6为最好。 研究了11种稀释剂并观察了分配比与介电常数之间的关系,最后选择强极性溶剂1,2-二氯乙烷为稀释剂。在1,2-二氯乙烷-7.5M HNO_3 条件下,初步实验结果表明络合物的组成为1:1。同时测定了其它金属离子的分配比,并计算了相应的分离系数。

 
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