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Table of Content

    24 March 1985, Volume 6 Issue 3
    Articles
    The Effect of Steam Treatment on the Zeolite HZSM-5 for Alkylation of Benzene and Ethylene
    Li Hexuan, Zang Yaru, Tao Keyi, Zhao Yingxian
    1985, 6(3):  191-196. 
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    The adsorption of ethylene and alkylation of benzene by reaction with elhylene on the zeolite HZSM-5 which was treated with super-heated steam have been studied. It is shown that the adsorptive properties and the catalytic activity are related directly to the acidity of the catalyst.
    Chemical Synthesis of Hydrogen-Storing Alloys(Ⅱ)——Replacement-Diffusion Method for Mg2Ni
    Shen Panwea, Zhang Yunshi, Yuan Huatang, Chen Shengchang, Zhou Jiaxiang
    1985, 6(3):  197-200. 
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    In this paper a chemical method for the synthesis of hydrogen-storing alloy Mg2Ni is presented, and powdered magnesium was used in excess to displace nickel in DMFso that Ni was deposited on Mg by stoichiometric amount. The Ni-coate Mg powder was heated at 550-580℃ for homogeneity of the alloy. The alloy thus prepared has excellent surface properties compared with that of the alloy prepared metallurigically, i.e, it has larger specific surface area, ease of activation, higher rates and lower temperatures for hydrogen absorption and desorption.
    Studies on Hydrolytic Polymerization of Rare Earth Ions(Ⅳ)——Hydrolytic Polymerization of Eu3+ and Gd3+ Ion
    Luo Qinhui, Ding Yi, Shen Mengchang
    1985, 6(3):  201-205. 
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    Hydrolyiic polymerization of Eu3+ and Gd3+ion was studied by potenliomclry at 25 ±0. 1℃.The concentration of rare earth ions ranged from 0. 1Mto 0.6Mand the ionic strength was kept at 2M NO3- with NaNO3 by self medium method. The composition and the hydrolysis constants of hydrolytic products were calculated by two different methods, the results of which agreed with each other fairly well.The hydrolytic state of Eu3+ and Gd5+ion was shown to be the same as that of Sm3+, but the degree of polymerization of the former two ions was higher.They formed poly-nuclear species. M2(OH)24+,M3(OH)45+ and M4(OH)66+ besides mononuclear species.
    Investigation of Anion-Exchange Behaviour for Molybdenum(Ⅵ) and Tungsten (Ⅵ) in Mixed Organic-Aqueous Solvents
    Cai Shulian, Zhou Zhiming
    1985, 6(3):  206-210. 
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    The anion-exchange behaviour of molybdenum(Ⅵ) and tungsten(Ⅵ) on a strong basic anion-exchange resin(Zerolit FF) has been investigated in hydrochloric acid and complexing agent (tartaric, citric and oxalic acid)-hydrochloric acid systems containing various kinds of organic solvent by means of batch method. The main factor effecting of organic solvent on the distribution of molybdenum(Ⅵ) and tungsten (Ⅵ)bet-ween resin and solution phases and the distribution mechanism are discussed. The results indicate that adding organic solvent favors complex-forming and increases the stability of the complexes. The possibility is offered for separation and concentration of trace amounts of tungsten(Ⅵ) from macro amounts of molybdenum(Ⅵ).
    Single Sweep Polarographic Study of Gold in the Phenylthiourea Medium
    Cao Guangzhou, Zhao Zaofan
    1985, 6(3):  211-216. 
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    In acidic phenylthlourea medium (pH2.2), by using single sweep polarography, gold can produce a sensitive cathodic polarographic wave at - 0.3V (vs. SCE). There is a linear dependence of wave height on gold concentration over a range of 5 ×10-8-3×10-6M. The method is good in selectivity and stability. After seperating and concentrating trace amounts of gold by the active carbon adsorption method, the method has been successfully applied to the determination of trace gold in ores.The mechanism of the polarographic wave was studied by a number of techniques. It was shown that phenylthiourea (PT) could be oxidized by Au(Ⅲ) to form sym-diphenyldithioformamidine (DF) which was strongly adsorbed by DME, then DFwas reduced at the electrode and produced a sensitive adsorptive polarographic wave. The mechanism may be represented as follows.
    Studies on Polarographic Adsorptive Complex Wave of Gallium-Alizarin Complexone
    Li Nanqiang, Zhang Jiankang
    1985, 6(3):  217-221. 
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    In a supporting electrolyte containing 3 × 10-5Malizarin complexone, 0.2M HAc-NaAc, at pH = 3.6, a sensitive adsorptive complex wave of gallium-alizarin complexone was obtained by using single-sweep polarography.
    Study on Colour Reaction of Mg-BPR-CPB System
    Xu Qiheng, Zhou Zhongwan, Yin Zhiyu
    1985, 6(3):  222-224. 
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    The new colour reaction of Mg-bromopyrogallol red (BPR)-cetylpyridinium bromide (CPB) system has been examined. The mechanism of increasing sensitivity has been discussed. Some samples have been analysed.
    Synthesis of Methyl 2-O-Benzyl-3,5-Anhydro-α-and β-D-Xylofuranoside
    Cao Lingbua, Liu Yuting
    1985, 6(3):  225-228. 
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    The title compounds with the 2, 6-dioxabicyclo-[3.2.0]-heptane skeleton were synthesized respectively from methyl 3,5-O-(1-methylethylidene)-α- and β-D-xylofuranoside (IAand IB) in five steps. This consists of benzylation, deacetonation, tosylation, acetylation and ring closure. Then the eight intermediates i.e. methyl 2-O-benzyl-3,5-O-(1-methylethylidene)-α- and β-D-xylofuranoside (ⅡA, ⅡB), methyl 2-O-benzyl-α- and β-D-xylofuranoside (ⅢA, ⅢB), methyl 2-O-benzyl-3, 5-di-O-tosyl-β-D-xylofuranoside (ⅣB), methyl 2-O-benzyl-3-O-acetyl-5-O-tosyl-a-D-xylofuranoside (Ⅵ A), methyl 2-O-benzyl-3, 5-anhydro-α- and β-D-xylofuranoside (ⅦA, ⅦB)were obtained sequentially. The key intermediates both Ⅳ Aand Ⅵ Bare crystalline. The mass spectra of these compounds have been given.
    Research of Organophosphorus Compounds (Ⅵ)--Synthesis of Chloro-Substituted Phenyl Esters of Thiophosphonic and Thiophosphinic Acid
    Wu Junhe, Bao Jianguang
    1985, 6(3):  229-232. 
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    Five phosphonates and nine phosphinates were prepared by the reaction of corresponding phosphonothioic chlorides and phosphinothioic chlorides with substituted phenols (or phenolates).
    Research on 2-(2'-Substituted Vinyl)-5-Biphenylyl Oxazoles
    Pan Jiaxing, He Jiaqi, Gao Zhenheng
    1985, 6(3):  233-237. 
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    Fifteen of the 2-(2'-substituted vinyl)-5-biphenylyl oxazoles were synthesized respectively by condensation of the corresponding 2-methyl-5-biphenylyl oxazole with benzaldehyde,substituted benzaldehydes or furfural in tha presence of alkali or acid. Their m. p., infrared spectra, NMRspectra, λman of UVspectra and fluorescence spectra, fluorescence quantum yield as well as laser properties of the compounds are listed in tables.
    Analysis of Organometallic Compounds (v)——A Study on the Paper Chromatography and Nuclear Magnetic Resonance of Bis(Alkylpentadienyl)Titanium, Zirconium and Hafnium Dihalides
    Yang Xuejin, Li Songlan, Chen Shoushan, Liu Yiyin
    1985, 6(3):  238-240. 
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    Paper chromatography and nuclear magnetic resonance for bis(alkylpcntadienyl)-titanium, zirconium and hafnium dihalides have been studied.Decane-heptane-acetone (1:5:6) and decane-cyclohexane-acetonc (1:5:6) solvent systems were used for the separation of bis(alkylpentadienyl)titanium, zirconium and hafnium dihalides by paper chromatography.The results have been discussed based on the relation among the obtained R1, δ values and other molecular characteristics.
    Syntheses of Crystalline Acyl-Ribo-& Arabino-Furanosyl Halides
    Cai Mengshen, Peng Siqi
    1985, 6(3):  241-243. 
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    The crystalline 2, 3, 5-tri-O-benzoyl-α-D-ribofuranosyl chloride was obtained for the first time. The Ness' method of synthesis of crystalline 2,3,5-tri-O-benzoyl-α-D-arabinofuranosyl bromide was improved and the yield of the product frommethyl 2, 3, 5-tri-O-benzoyl-α-D-arabinofuranoside was raised from 61% to 96%.
    Calculation of the Non-Bonded Atom Pairs Distance in Straight Chain Paraffins with Analytical Projective Method
    Zhang Xuesong
    1985, 6(3):  244-248. 
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    The distance between non-bonded atom pairs have been calculated by use of analytical projective geometry method. The distance of non-bonded atom pairs attached to the adjacent molecular chain atoms, rab(φi), is given asThe distance between non-bonded atom pairs attached to the non-adjacent molecular chain atoms, ra b(φii+1) is given asThe method suggested by the present author is simple but valid only for those chain molecules without double bonds.
    Molecular Intergration and Molecular Symmetry——Application of Local Symmetry of a Molecule in ab initio Program
    Jic Caoxian
    1985, 6(3):  249-252. 
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    The principl that the molecular symmetry can be used to simplifying the calculations of a vast amount of many-center integrals by other workers has been proved with mathematical method. The method with which the local symmetry of a molecule is also used to simplify this sort of evaluations has been put into effect on MQAB 80 ab initio program. Having qualities of covenient and effective, the sample calculations being performed show that this method can save the CPUtime up to 50% or even more.
    A Study on Vapour-Liquid Equilibrium of Binary System for Ethyl Acetate and Water
    Ouyang Fucheng, Wang Guangquan, Li Liqun
    1985, 6(3):  253-257. 
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    The isobaric Vapor-Liquid equilibrium data at 760 mmHg of binary system for ethyl acetate and water have been determined by a self-designed equilibrium still and tested to be in keeping with thermodynamic consistency by Herrington empirical method. Compared with the values calculated by 13 correlated equations of activity coefficient, the data are fairly satisfactory, in particular, the imitation accuracy of the values obtained by McCann equation are the best.
    Synthesis, Properties and Structure of Cluster Complex (Et4N)3(Mo2FeS8O2)·CH3CN
    Liu Xisheng, Xu Jiqing, Niu Shuyun, Li Shuqin
    1985, 6(3):  258-262. 
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    Tn this paper, synthesis, structure and properties of a new Mo-Fc-Scluster complex (Et4N)3(Mo2FeS8O2)·CH3CN (Ⅰ) with oxygen coordinated to Mo atom are reported, in which UV-Vis. spectra, IRspectra, Mossbauer spectra, eletrochemical properties and catalytic activity reducing C2H3 to C2H4 are involved. Our conclusions obtained from contrasting properties of the complex with that of the complex (Et4N)3(Mo2FeS8O3) (Ⅱ) and (Bu4N)3(Mo2FeS8O) (Ⅲ) previously reported by us are as follows (1) the electrochemical data show that the order of ability for obtaining electron is Ⅰ<Ⅱ<Ⅲ, (2) the order of stability in air is Ⅰ > Ⅱ>Ⅲ, (3) the order of symmetry is Ⅱ>Ⅰ > Ⅲ, (4) the order of reducing C2H3 to C2H4 by catalysis is contrary to that of stability.
    Thermodynamics of Multicomponent Electrolyte Solutions(Ⅳ)——Activity Coefficients of HCl in System HCl+ CoCl2 +H2O from 5 to 45℃
    Chu Miflgchen, Yang Jiazheu, Liang Chunyu
    1985, 6(3):  263-264,286. 
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    Electromotive force of cell Pt,H2(g, latm)|HCl(IA),CoCl2(IB)| AgCl-Ag has been measured and the activity coefficients determined in the system with the total ionic strength I between 0.5 and 5.0 mole· kg-1 over the temperature range 5-45℃ obey the Harned's Rule. Under the condition of constant components of mixtures the logarithm of HCl activity coefficients is a linear function for temperatures, Ig γA = a + bT, whereγAis the activity coefficient of HCl, a and b are constants related to the component and total ionic strength in mixed solutions.
    Catalyst Study of Manufacturing Methacrylic Acid from Oxidizing Iso-Butyralaldehyde
    Wu Tonghao, Yang Hongmao, Wang Guojia, Jiang Yuzi, Chi Hongpan, Chung Shaozun, Zhao Hongtu, Ding Xiliang
    1985, 6(3):  265-266. 
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    In this paper, it is reported that iso-butyralaldehyde (IBA) is directly oxided to methacrylic acid (MAA) by P, Mo, Vheteroacid salt containing rare earth. In space velocity 1500 hr-1 and IBA: O2:H2O:N2 = 1:2.5,: 7:10 (mole ratio) conditions, yield of MAAis 63% and yield of methacrolein is 15% in single way, total yield of MAAexceeds 70%. Comparing with two step method of iso-butyralaldehyde oxidation, yield of MAAis raised over 10% and difficulty of separating iso-butyric acid and MAAcan be avoided. The method is the most economical route.
    Preparation and Perfor mance Determination of Coated Wire Silver/Sulphur Ion-Selective Electrode
    Zeng Binli, Li Xichun, Jiang Wengqin, Zhu Limin
    1985, 6(3):  267-269. 
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    The authors have chosen the optimum conditions for preparing coated wire silver/sulphur ion-selective elcctrodes (i. e. Ag/Ag2S), have also determined various performances of the electrodes. With respect to the reversibility and the resistance to oxidation of the electrodes, defferent conclusions from the literature have been obtained.
    A Study on the Compatibility of Blends of Poly (Vinyl Chloride) (PVC) with Ethylene Vinyl Acetate(EVA) Copolymers
    Wang Yingkang, Ma Bin
    1985, 6(3):  270-274. 
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    TPAand FTIRstudies of blends of EVAcopolymers and PVCare Presented in this paper. The results demonstrate that the blends of the EVAcontaining 34-35% VAand PVCare incompatible and the 75/25 and 50/50 blends of the EVAcontaining 70% VA/PVCexhibit single phase Tg while the 25/75 blend exhibits two mixed EVA/PVCphases.The shifts of the vs(C=O) in FTIRspectra indicate there are specific inter-molecular interactions between the EVA-70 and PVCmolecular chalnsr egardless of one or two mixed EVA/PVCphases.
    Thermal Melting Behavior of the Ultra High Molecular Weight Polyethylene Studied by Thermal Analysis
    Liang Kuiming, Tan Xixun, Lu Yun, Lin Shang'an
    1985, 6(3):  275-280. 
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    The thermal properties, of various initial ultra-high molecular weight polyethy-lcne(UMWPE MMw = 70-315×104) powders obtained from highly active catalytic polymerization of ethylene have been studied by differential thermal analysis and differential scanning calorimetry. By plotting the ratio of △ H1 to △H2 against molecular weight of polymer, a linear correlation is given by Y = 0.95 + 0.28× 10-6Mw, where Y = △H1/△H2 and △H1 and △H2 are the heat of fusion of nascent polyethylene and cooling specimen of melted polyethylene respectively.The double melting endotherms of UMWPEcan be observed when the samples crystallized from polymerization were annealed in proper condition. The melting peak of the high temperature can convert into the melting peak of the low temperature inconvertibly with different annealing time and temperature. It is reasonable to say that when the molecular weight of polyethylene formed in the polymerization system is very high (MMw≥70 × 104), the crystal chain conformation of nascent polyethylene is mainly extended and after being melted and then recrystallized on cooling, it can be converted into less extended or partially folded conformation with more crystalline deficiency.
    Studies on the Reaction Mechanism of Polymerization of Furaldehyde by Torsional Braid Analysis
    Zhou Chaohua, Zhang Tianli
    1985, 6(3):  281-283. 
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    The reaction mechanism of polymerization of furaldehydc has been studied by torsional braid analysis.Experiment results showed this relationship between quantity of this catalyst and temperature of reaction of polymerization of i'uraldehyde. this relationship between in the course of the reaction and the time of reaction of polymerization of furaldehyde.The quantity of this catalyst decided to temperature of reaction of opening-ring of furaldehyde.