bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Extracting Vanadium from Coal Vanadium Ore
Authors: Xi Cheng
Published: December 2011

Coal vanadium ore from Hunan was pretreated by sulfuric acid for curing. Influences of curing time, curing temperature, sulphuric acid concentration and ore size fraction on vanadium leaching rate were investigated and discussed. Test results showed that: -100 mesh ore size was cured by 20% added quantity of sulphuric acid at 180°C for 24h and was leached by agitation with tap water, the liquid solid ratio of 4: 1 at room temperature for 12h, vanadium leaching rate was 74%
Development of Composite Adsorbents of Activated Carbon and Hydrophobic Silica Gel for Gasoline Vapor Adsorption
Authors: Huang Wei Qiu , Hu Zhi Lun , Bai Juan
Published: December 2011

A composite adsorbent with upper-layer activated carbon (TY) and lower-layer hydrophobic silica gel (HSG) was developed, based on the comprehensive consideration of both adsorption capacity and adsorption heat of activated carbon and hydrophobic silica. For the composite adsorbent, various volumetric ratio of activated carbon to silica gel was designed, and the adsorption capacity and heat effect of the composite adsorbent with different ratio were investigated. The experimental results showed that the optimum ratio was 1:1. Thus, the vapor with high concentration was early adsorbed by the lower-layer hydrophobic silica gel, and then the residual vapor with low concentration was late adsorbed by the upper-layer activated carbon. In this way, incombustibility of silica gel and high adsorption capacity of activated carbon were fully utilized; accordingly the adsorption operation safety was improved and the adsorption capacity of activated carbon was increased owing to that the activated carbon was only used to adsorb the vapor with low concentration.
Energy Consumption Analysis of Level Circulating Cooling System in Sanhejian Deep Coal Mine
Authors: Zhang Yi , Guo Dong Ming , Meng Li
Published: December 2011

With the deep mining in coal mine, heat damage is one of the technical issues need to be solved. HEMS cooling system in Sanhejian Coal Mine is a process system for high-temperature heat damage controlling in deep coal mine, in which cool energy extracted to reduce work face’s ambient temperature to achieve heat damage controlling. Part of the cool energy is from the level circulating of cooling water in -700 level main raodway, the other is from the mine water. We analyze the energy consumption of every subsystem during operation of the HEMS system, which could provide a theoretical basis and technical guidance on more efficiently running of cooling system deep in the future.
Studies on the Antioxidant Activities of Total Alkaloids from the Fruits of Evodia rutaecarpa (Juss.) Benth
Authors: Tan Ming Xiong , Liu Yan Cheng , Luo Xu Jian , Li Dong Qing
Published: December 2011

The total alkaloids (TAE) were obtained from the fruits of Evodia rutaecarpa (Juss.) Benth. The antioxidant activities of TAE towards the inhibitory effect on 2, 2’-diphenyl-1-picrylhydrazyl (DPPH) free radical, total antioxidant capacity, and inhibition on lipid peroxidation were investigated. TAE was found that the total antioxidant capacity and inhibitory lipid peroxidation are superior to synthetic antioxidant 2, 6-di-ter-butyl-4-methylphenol (BHT), but scavenging activity on DPPH radical is lower than that of BHT at the same condition.
Pollution and Control Measures of Livestock Breeding with Acceleration of China`s Urbanization
Authors: Yang Zai Fu , Xu Lian Lian , Yao Chuen Yun
Published: December 2011

Abstract: Based upon questionnaire and survey, available documents, random interview, logical analysis and mathematical statistics, livestock breeding pollution are researched at Shanghai Songjiang during the process of urbanization. In order to sure the health development of livestock and poultry in the future, the problem and research way in control of environmental pollution from stockbreeding were analysed, It is of vital importance for livestock husbandry to have a thorough understanding of such challenges and take corresponding countermeasures against livestock breeding pollution.
The Preparation of Ferronickel Powder from Nickel-Contained Sodium Jarosite Residue
Authors: Ren Rui , Zheng Shu Ping , Zhang Qian
Published: December 2011

nickel and iron was recovered as ferronickel from sodium jarosite residue containing nickel, the processes include alkaline decomposing residue, hydrogen reducing precipitations produced in alkaline decomposition process and magnetic separating reduced precipitations. The effects of alkaline decomposition temperature, the concentration of NaOH solution and solid/liquid ratio on the process of alkaline decomposing residue were examined. Meanwhile, the influence of hydrogen reduction temperature on the reduced products was studied, too. The results shown the natrojarosite in residue can be near completely decomposed to form hydroxide precipitations in the process of alkaline decomposition. In the process of hydrogen reduction, the rise of reduction temperature can increase the percent reduction for both nickel and iron in reduced results. But it is easier to reduce nickel than to reduce iron at the range of 750°C-950°C. When hydrogen reduction temperature was 950 °C, the percent reduction for nickel and iron in hydrogen reduction process was 95.81% and 94.4%, respectively. XRD tests indicated, except for ferronickel, there were still some impurities such as barium sulfate and barium oxide in reduced product. SEM test indicated the particles of precipitations will become fused together during hydrogen reduction process, so it is difficult to magnetic separate ferronickel purely from reduced results. The content of nickel and iron in magnetic separating product was only 11.64% and 62.40%.
Selection of Salting Agent for Extractive Distillation of Ethanol-Water System
Authors: Yang Yue Yun , Wang Xiao Guang
Published: December 2011

The selection of salting agents for extractive distillation of ethanol-water system through analyzing the vapor-liquid equilibrium (VLE)data was studied. Firstly, the atmospheric VLE data of the ethanol-water system were measured, and the reliability of the vapor-liquid equilibrium apparatus was tested by comparing the measured VLE data with those reposed in the literature and by checking their thermodynamic consistency.Secondly, the atmospheric VLE data of the Ethanol-water system with agents were measured, and also the changes in relative volatility and the selectivity were checked, so that the optimum agent lithium chloride was then selected. Finally, the impact of the lithium chloride concentration on VLE data of Ethanol-water system was studied.
Quantification and Enrichment of Esculeoside a from Fresh Tomato Fruits
Authors: Lu Feng Lai , Liu Jin Lei , Li Dian Peng , Wu Jian Zhang , Chen Yue Yuan , Wen Yong Xin
Published: December 2011

Esculeoside A, the tomato saponins from Lycopersicon esculentum MILL, may be metabolized into various steroidal hormones such as pregnane derivatives that are expected to exhibit various bioactivities in the body, such as anti-osteoporosis, antimenopausal disorder and anti-tumor actions. In order to enrich large amount of esculeoside A for further scientific research, we firstly developed a high performance liquid chromatography (HPLC) with evaporative light scattering detection (ELSD) method for its quantification, and used it to examined the content of esculeoside A in different cultivated varieties of tomato fruits and tomato extract. Statistical analysis of the obtained data demonstrated that our method was simple, and has achieved desired linearity, precision and accuracy. Then we have explored the feasibility of using pectinase as a means for assisting esculeoside A extraction from fresh tomato fruits, and several factors such as the enzyme concentration, pH value of enzyme solution, temperature, incubation time which influenced on extraction were investigated. Moreover, in our previous study, the adsorption characteristics on several types of macroporous resins have been compared. Among them, D-101 resin showed the best separation behaviors on esculeoside A. So in the present paper, in order to get the best parameters for D101 adsorption, the adsorption kinetic curve, the appropriate ethanol concentration for elution and breakthrough volume were analyzed．
Test Study on Creep Character of Anchor Rod in Argillaceous Soft Rock
Authors: Fan Qiu Yan , Liu Cai Lin , Yang Ke Qing , Wang Mei Qian
Published: December 2011

The creep character of anchor rod in argillaceous soft rock is remarkable. The big undisturbed mudstone samples in Nanning Basin as a typical argillaceous soft rock is chosen to the research object in this paper. The laboratory simulated destructive tests and the creep tests of full grouted anchor rod have been down. Through the destructive tests of mudstone sample, the instantaneous adhesive strength between the anchor body and mudstone in Nanning Basin is 70kPa. By analyzing the creep curves of anchor rod, a conclusion is that there is a long-term adhesive strength of anchor rod in argillaceous soft rock. When the design adhesive strength of anchor rod is less than the long-term adhesive strength, eventually the anchor rod is stable during the process of long-term pull-out. When the design adhesive strength of anchor rod is greater than the value, the creep of anchor rod with the time will do not stop until the anchor rod failure. The greater difference value between the instantaneous and long-term adhesive strength, the faster the rate of creep, the faster the anchor rod failure. Finally, for the permanent support engineering design of anchor rod in argillaceous soft rock, the paper gives two principles, as follows: (1) the design of anchor rod in argillaceous soft rock must be determined according to the long-term adhesive strength. (2) by using variety of technical measures, the impact of various factors on the creep of anchor rod will be decreased.
Adsorption of Grape Seed Procyanidins on Macroporous Adsorbent Resin: Isotherms and Thermodynamics
Authors: Song Ying Hua , Zhang Gui Zhi
Published: December 2011

The adsorption properties,including the adsorption isotherms,thermodynamics,of grape seed procyanidins onto macroporous resin HZ818 are investigated.Both the Langmuir and Freundlich equations can provide a good fit to the adsorption isotherms, which indicates an endothermic and a favorable process in our study.The capacities of the adsorption increase with temperature. The negative values of ΔG and values of ΔH lower than 40 kJ/mol indicate a spontaneous physical adsorption, and the positive values of ΔS show the increased randomness at the solid/solution interface during the adsorption process.
The Study on Technique of Extracting Cytochrome C
Authors: Deng Fang Yi , Wu Xin She
Published: December 2011

Cytochrome C is bio-oxidation process of electron transfer in vitro. Effects are similar to Coenzyme. The role is similar to coenzyme. In the case of enzymes, it can promote on oxidation and reduction as a rapid enzymatic action. In this study, Cytochrome C extraction method is discussed. By discussing the way of extracting Cytochrome C, the better methodology of extracting material and technique has been found.
RETRACTED: A Novel Method for the Treatment of Wastewater Containing High Concentration of Copper and Arsenic
Authors: Zhang Bao , Zhang Jia Feng
Published: December 2011

Arsenic contamination of water and associated health risks have been reported in many regions of China. Leaching of arsenic from industrial wastewater into groundwater may cause severe contamination, which requires proper treatment before its emission. Therefore, sulfur dioxide reduction combined diffusion dialysis method is adopted to dispose the wastewater containing high concentration of copper and arsenic. Effects of the sulfur dioxide reduction process of the flow of sulfur dioxide, reaction time, reaction temperature and stirring speed and the diffusion dialysis process of the influent acidity, water flow velocity and material flow velocity on the ratio of separation of arsenic and copper were studied in this paper. The results show that on the conditions of the flow of sulfur dioxide of 3 kg/h, reaction time of 1h, at room temperature, stirring speed of 800 r/min and influent acidity of 5 g/L, water flow velocity of 400 ml/h, material flow velocity of 400 ml/h, the integrated effect of separation is best. The separation ratio of copper reaches 94.71 % and that of arsenic is up to 95.63 %.
Discussion on Theory and Practice of Tri-Intrinsic Safety Management in Mine Enterprises
Authors: Zhang An Yuan
Published: December 2011

China’s mine enterprises have gradually advanced towards the direction of collectivize and large-scale development, which requires continuous improvement and innovation on safety management. Based on the actual situation of safety management in China’s mine enterprises, this paper gave a general analysis of three principles in mine enterprises as material-oriented safety management, humanistic safety management and heart-oriented safety management and their adaptation in practice, as well as their limitations, and at last, it put forward a scientific implementation method. In addition, this paper discussed a model of Tri-intrinsic safety management which integrates three ideological principals of material-oriented safety management, humanistic safety management and heart-oriented safety management into mine enterprises. Based on Marxism theory on law of social and human development, Tri-intrinsic safety management is devoted to achieve the unification of safety values of employees and enterprises, the unification of people’s health and safety, as well as ego-development and production efficiency. Meanwhile, this model complied with the development trend of safety management in China’s mine enterprises, which can promote safety management of mine enterprises to a new level of development.
Crystallization and Separation of Potassium Vanadate in Highly Concentrated Potassium Hydroxide Solution
Authors: Yang Na , Zheng Shi Li , Wang Shao Na , Qin Ya Ling , Xie Wan Li , Zhou Bing Jing , Zhang Yi
Published: December 2011

The crystallization behavior of potassium vanadate from highly concentrated potassium hydroxide aqueous solution was investigated. The effect of various parameters including KOH concentration, V2O5 concentration, final crystallization temperature, cooling rate, stirring speed and additive amount of seed were examined. The optimal experimental conditions for K3VO4 crystallization were obtained as follows: KOH concentration 800850 g/L, KOH-to-V2O5 mass ratio 8~9, stirring speed 200 r/min, crystallization temperature from 80°C to 40°C with natural cooling, and seed addition 2% wt. Under optimal conditions, the K3VO4 crystallization yield of 87% was obtained, and the purity of crystals was about 90%.
The Consequence Analysis of Pressure Vessel Failure
Authors: Xing Zhi Xiang , Wang Xian Jin
Published: December 2011

After a chemical vessel suffering a rupture, BLEVE, fireball, jet fire, and dispersion of toxic substance may be the most common failure ways. Which give rise to a great threat to people’s life, process plants and surrounding environment. This paper presents an overview of the mechanism and the consequences for these failures; finally, ALOHA software simulation resorted to evaluating the consequences for all kinds of hazard, a vertical tank with the size of diameter=10, tank length=20m, containing the propane liquid/gas mixture with a volume of 1571 cubic meters, the mass of the chemical is calculated by the software automatically with a value of 554 tons. All the possible failures have been simulated by the ALOHA software, including：1) leaking tank, chemical is not burning as in escapes into the atmosphere; 2) leaking tank, chemical is burning as a jet fire; and 3) BLEVE, tank explodes and chemical burns in a fireball. Furthermore, there are three types hazard available to analyze the situation that chemical is not burning as it escapes into the atmosphere, they are: a) toxic area of vapor cloud; b) flammable area of vapor cloud; and c) blast area of vapor cloud explosion. The result reveals that the farthest threat zone reaches 2.2km in the case of a fireball triggered by a BLEVE, and the result has been viewed and discussed in details.
Experiment Study on the Performance of the Two Centrifugal Fans in Series
Authors: Miao Xiao Ping , Sui Lu Yan , Jia Dai Yong , Wang Bo , Li Wei Hua , Wang Li Jun
Published: December 2011

The running of the two centrifugal fans is widely used in the industry process. Based on the tested performance of the signal fan, the experiment study on the two fans in series is carried out. According to the experiment, the paper gets the characteristic curves between flow and total pressure、between flow and power、between flow and efficiency, It can provide the experimental basis for the parameter selection of the fans in series.
Application of Wavelet Neural Network in Cortisol Solubility
Authors: Chen Jian Xin , Shi Xu Na , Pang Shu Chun , Zhang Mei Jing , Li Sheng Yu
Published: December 2011

Wavelet neural network(WNN) was applied to predicate the cortisol solubility. The model consists of a multilayer feedforward hierarchical structure, and the flow of information is directed from the input to the output layer by using wavelet transforms to achieve faster convergence. By adaptively adjusting the number of training data involved during training, an adaptive robust learning algorithm is derived for improvement of the efficiency of the network. The neural network was trained and simulated cortisol solubility with different input and output parameters. Simulation results confirmed that this approach gave more accurate predictions solubility.
Catalytic Activity of Dehydrogenation of Methanol to MF over Cu/MCM-41 and Cu-ZnO/MCM-41 Prepared by Impregnation and Grinding
Authors: Li Guo Ru , Li Gong , Zhou Shu Xi , Tong Hui Juan
Published: December 2011

Abstract. Using MCM-41 molecular sieves as the support, Cu-ZnO/MCM-41 and Cu/MCM-41 catalysts were prepared by impregnation and grinding. The catalysts were characterized by XRD, N2 adsorption-desorption and TPR methods. The catalytic activity of the dehydrogenation of methanol to methyl formate (MF) was evaluated using the flow microreactor under atmospheric pressure. According to the results, the catalyst prepared by impregnation had a better selectivity for the MF, but a lower methanol conversion rate. However, the product's selectivity could be improved by adding ZnO additive while the methanol conversion rate was reduced. For Cu/MCM-41 prepared by impregnation and grinding, the methanol conversion rate was 20.18% and 24.13% respectively at 250°C and the MF selectivity was 73.75% and 67.35% respectively. Likewise for Cu-ZnO/MCM-41 prepared by impregnation and grinding, the methanol conversion rate was 15.28% and 18.83% respectively at 250°C and the MF selectivity was 81.31% and 75.32% respectively.
Characterization of Ru on Activated Carbon Catalysts Prepared by Supercritical Carbon Dioxide Impregnation
Authors: Xu San Kui , Li Li Min , Li Rui , Guo Nan Nan , Zhang Peng
Published: December 2011

In this work, a novel method was reported for preparation of Ru/activated carbon (Ru/AC) catalysts. Supercritical carbon dioxide (SC CO2) was employed as medium for the impregnation of ACs with inorganometallic precursor of RuCl3. The Ru/AC catalysts displayed excellent activity for the catalytic hydrogenation of D-glucose. Selected Ru/AC catalysts were characterized by N2 adsorption-desorption, TPR and TEM analysis. The results show that the order of effects on catalytic activity are supercritical temperature > supercritical pressure > amount of co-solvent > time of impregnation. The optimal supercritical parameters for preparing Ru/AC catalyst were 313 K, 8 MPa, 4 ml of methanol and 9 h, respectively. The highest reaction rate of hydrogenation reached 86.35 mmol•min-1g-1Ru, upgrading 42.96% compared with the activity of conventional Ru/AC prepared using aqueous impregnation. The SC CO2 impregnation could result in Ru uniformly dispersed on the outer surface and in the pore of AC, leading Subscript textto higher dispersion of Ru and enhanced interaction between AC and Ru. Furthermore, the enhanced interaction induces improved reduce temperature. Consequently, the catalytic activity of Ru/AC catalysts is improved significantly.
Molecular Characterization of Noble Metal Adsorption at the Water-Aluminum Oxide Interface
Authors: Liu Jian Ming , Regalbuto J. R.
Published: December 2011

We have obtained relatively unambiguous evidence that validates a simple, predictive model describing the uptake of noble metal coordination complexes from aqueous solutions onto oxide surfaces. The results confirm that the metal-oxide interaction is essentially electrostatic in nature. The evidence has been obtained by applying extended x-ray absorption fine structure (EXAFS) analysis to noble metal adsorption systems in which the effect of surface-localized pH has been isolated and quantified. The model has applications ranging from catalysts preparation to heavy metal pollution abatement and precious metal recovery.
Preparation and Aplication of Cation Adsorbent by Canada Goldenrod (Solidago canadensis L.)
Authors: Yang Zai Fu , Yang Xiao Jing , Sun Li Hong , Xu Lian Lian
Published: December 2011

ABSTRACT: Cation adsorbent was prepared from the Solidago Canadensis（which are abandoned agricultural land of alien invasive plants）by Sulfuric acid esterification modified , isoamyl alcohol as reaction medium. Design L934 orthogonal experiment, the Solidago canadensis cation exchange adsorbent, the optimal preparation conditions. Experimental results show that at 15°C, concentrated sulfuric acid and amyl alcohol volume ratio of 5:6 obtained under conditions of Solidago canadensis cation exchange adsorbent for Pb(II) exchange best. The experimental results of Pb(II) adsorption onto the Solidago Canadensis based cation adsorbent showed that the best conditions are: the initial pH 5, the concentration of Pb(II) 300mg/L，the dosage of cation adsorbent 1.2mg/L and adsorption time 3h. The adsorption data were analyzed by using pseudo-first-order and pseudo-second-order kinetic models were found to follow the pseudo-second-order kinetic model.
Preparation and Catalytic Properties of SrFe2O4 in Selective Oxidation
Authors: Jia Tai Xuan , Yan Shao Feng , Liu Zi Li
Published: December 2011

The effect of catalyst atomic ratio on the performance of styrene selective oxidation by H2O2 as probe reaction over spinel type strontium ferrate prepared through sol-gel method was investigated. The catalyst evaluation results show that the optimum catalyst atomic ratio was n(Fe):n(Sr)= 2:1 with high catalytic activity. The catalysts were detected by XRD. The optimum calcination temperature was 700 °C. Micro-structure and essence disciplinarian of strontium ferrate were disclosed. Under normal atmospheric pressure and 0.5 g catalyst dosage conditions, the optimum feed ratio, reactive temperature and reactive time are n(H2O2):n(styrene)=1:1, 343 K and 9 h, respectively. The selectivition and yield of benzaldehyde were 65.7% and 34.3%, respectively. The technological process route possessed under ambient conditions with advantage such as excellent properties in product.
Effect of Copper Compounds on the Synthesis of Diphenyl Carbonate from Transesterification Catalyzed by n-Bu2SnO
Authors: Du Zhi Ping , Chen Shi Rui , Shen Chen , Zhou Bin , Huang Li Ming , Wang Gong Ying , Wu Yuan Xin
Published: December 2011

Effect of copper compounds on the catalytic activity of n-Bu2SnO in the transesterification of dimethyl carbonate and phenol to diphenyl carbonate was investigated. The results showed that they as promoters could obviously enhance the activity of n-Bu2SnO except for Cu. The characterizations of X-ray diffraction (XRD) identified that CuO could be reduced to Cu, and Cu2O was stable. When the reaction was carried out between 150 and 180 oC, with molar ratio of n-Bu2SnO to Cu2O of 8:1, catalyst amount 0.0067, reaction time 10h, molar ratio of dimethyl carbonate to phenol of 3:1, the phenol conversion and the transesterification selectivity were 60.3% and 99.2%, respectively. In the transesterification, the acid-base synergistic effect between Cu2O as the basic promoter and n-Bu2SnO as the Lewis acid resulted in the active enhancement of n-Bu2SnO. Moreover the performance of Cu2O remained unchanged for seven times reuse.
The Controlling Synthesis and Photocatalytic Activity of Carbon Nanotubes Loaded with CdS Composites under Simulated Sunlight
Authors: Li Huan Ying , Bai Shu Li , Guan Yu Jiang , Wang Zi Bo
Published: December 2011

The CdS/CNTs nanocomposites were prepared by a simple heating refluxing method, and the scattering of CdS on CNTs surface was controlled by a dropping way. The samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscope (UV-Vis) .The photocatalytic activity of the samples was tested in the degradation of Methylene blue dye wasterwater under simulated sunlight with 500w short arc xenon lamp. The results showed that the photocatalytic activity of CdS/CNTs composites was enhanced by controlling CdS scatter on CNTs surface, and the forbidden band width was appropriate lowered when CNTs was added, and the scatter of CdS on CNTs surface was uniform and the photocata-lytic activity was the highest when the mass ration of CdS with CNTs was 4:1.The CdS composites have good stability and potential industrial application.
Study on Properties of Al2O3 -CaO-SiO2-CaF2 Slag System
Authors: Peng Ke Wu , Zhang Peng , Xie Jian Guo , Ma He Li
Published: December 2011

Liquidus temperature, electrical conductivity and phase composition of Al2O3－CaO－SiO2－CaF2 System were studied. The results showed that the liquidus temperature of the slag decreased with increasing CaF2 content, and its electrical conductivity increased with increasing CaF2 content and temperature. When the content of CaF2 is 20%, the liquidus temperature is 1469°C. When the contents of CaF2 is 10%，its main phase compositions are composed of Ca5Al6O14、Al2Ca3(SiO4)3、Al2(SiF6)3 and Ca3Al10O18. Ca2AlF7、Ca2Al3O6F becomes more and more with increasing the content CaF2 because of F1- replacing O2- in molten slag.
Preparation and Properties of La/Ni-MoS2 Composites in Catalytic Hydrogenation of Sulfolene
Authors: Jia Tai Xuan , Zhang Ji Chang , Liu Zi Li
Published: December 2011

Effect of ultrasonic waves, premonitory LixMoS2 and La/Ni-MoS2 composites were prepared by n-butyl lithium intercalating in the MoS2 layers, using the single-molecular-layer exfoliated-restacked technology. The effect of catalyst on the performance was investigated with catalytic hydrogenation of sulfolene over composites as probe reaction. The catalyst evaluation results show that the optimum atomic ratio, hydrogen pressure and reactive temperature were n(La):n(Ni) = 0.05, 2.5 MPa and 60 °C, respectively. Under such condition, conversion of sulfolene was 99.8%, the yield of sulfolane reached 95.5%.
Study of Ziegler-Natta /Metallocene Hybrid Catalyst on Pilot Device
Authors: Wang Jing , Liu Xiao Yan , Jia Jun Ji , Chen Xu , Zhu Bo Chao
Published: December 2011

In this work, Ziegler-Natta/Metallocene hybrid catalyst (Z-M) was prepared magnifying. The activity and copolymerization behavior of the catalyst were evaluated through 10L model device. Model experiment results confirmed that the catalyst was suitable for Spheripol-II PP pilot device. Subsequently, pilot experiment was carried out on 75 kgPP/h Spheripol-II PP pilot device. SP179 which was prepared by traditional Ziegler-Natta catalyst was used as a reference object. Pilot experiment results showed that: Z-M hybrid catalyst demonstrated good activity and copolymerization properties. The resultant polypropylene in-reactor alloys have better impact strength and flowability than SP179. These alloys showed good stiffness-toughness balance. The impact strength and the flexural modulus of the best alloy was 50 kJ/m2 at 23 °C and 848 MPa, respectively. The other performances were similar to that of SP179. But Z-M hybrid catalyst required lower feed ratio of ethylene than the traditional Ziegler-Natta catalyst for SP179.
A Study of a New Cleaning Agent for Post-CMP Pattern Wafer
Authors: Gao Bao Hong , Zhu Ya Dong , Tan Bai Mei , Wang Chen Wei , Niu Xin Huan , Huang Yan Yan , Liu Yu Ling , Wang Juan
Published: December 2011

In this paper, it studies a new cleaning agent for post CMP pattern wafers. The polyamine chelating agent R(NH2)n complexing agent is used in pattern post-CMP cleaning, and the inhibitor BTA can effectively protect the wafer. The surfactant should be appropriate, and the concentration should be 1.5 ‰.
Bromine-Mediated Phenol Synthesis from Benzene
Authors: Li Ling Bo , Li Wen Sheng , Ren Yang Qun , Zhou Xiao Ping
Published: December 2011

Phenol was synthesized from the hydroxylation of bromobenzene, which was prapared by reacting benzene with bromine. In the benzene bromination reaction, HZSM-5 (Si/Al = 400/1) was found to be a stable catalyst, which catalyzed the stoichiometric reaction of benzene with bromine. More than 90% of bromobenzene selectivity was reached over HZSM-5 and the byproduct was dibromobenzenes. In the second reaction, bromobenzene reacted with a cataloreactant to form metal bromide and phenol. This is a catalytic as well as stoichiometric reaction between bromobenzene and the metal oxide. It was found that only the supported highly dispensed metal oxide was reactive to the bromobenzene hydroxylation reaction. In this investigation, 10mol%CuO/SiO2 was found to be the most active cataloreactant for bromobenzene hydroxylation reaction.
Catalytic Oxidative Desulfurization of Model Fuel Using [HPMo][HTAC]2/SiO2 as a Amphiphilic Catalyst
Authors: Li Qi Na , Wang Guang Hui , Qiu Jiang Hua , Wang Ning , Zhang Qi Gang , Lei Qi , Hu Yu Li , Zhang Yu Qin
Published: December 2011

Mesoporous catalysts [HPMo][HTAC]2/SiO2 with different loading amount of [HPMo][HTAC]2 were prepared by sol–gel method. The catalysts were characterized by XRD, FT-IR, SEM and pore structure parameters. The catalytic activity for the oxidative desulfurization of benzothiophene (BT) and dibenzothiophene (DBT) was evaluated using hydrogen peroxide as an oxidant. Results of the charaterization show that the Keggin structures of all the loaded catalysts were kept and [HPMo][HTAC]2 was highly dispersed on the surface of SiO2. The desulfurization rate of the catalyst 20%[HPMo][HTAC]2/SiO2 can be up to 91% for DBT and 75% for BT in 2 h.
Preparation of Layered Double Hydroxide (LDHs)-Supported Gold Catalysts and its Activity and Stability for Low-Temperature CO Oxidation
Authors: Wang Peng , Zhu Lin Hua
Published: December 2011

A new type of gold catalysts have been prepared by supporting gold colloids on layered double hydroxide (MgAl-LDHs) carrier at different pH values. CO oxidation reaction at room temperature was used as probe reaction to test the oxidation activity of the gold catalysts, and X-ray diffraction (XRD), X-ray fluorescence (XRF) and high resolution transmission election microscopy (HRTEM) techniques were used to characterize the physical phase, gold loading, morphology as well as mean diameter of gold particles and particle distribution of the represented gold catalyst samples. Influence of pH value during synthesis of the catalysts on the gold loading and oxidation activity of the gold catalysts was studied. Besides these, the stability of the gold catalysts was investigated by thermal treatment and exposure to air and natural light for a long time. The results indicated that gold colloids can be attached on the carrier easily when pH value was controlled between 6-7, and gold loading in the gold catalysts prepared in this condition was above 1.3wt.%. 100% conversion of CO at room temperature can be obtained when the fresh prepared catalysts had been calcined in the air for 2 h at 473 K. The HRTEM images of the gold catalyst showed that the gold particles were highly dispersed on the surface of the carrier, and the average size of the gold particles was 3.2 nm. After thermal treatment at 723 K or storage 4 weeks in air, gold particle size was still kept less than 5nm and the conversion of CO at room temperature over the aged catalysts achieved 100%.
A Study on Dexing Copper-Molybdenum Flotation Separation with a New Low- Molecule Inhibitor
Authors: Liao Xing Jin , Mu Xiao
Published: December 2011

The inhibitor was high consumption of low-efficiency of depressant in the separation of copper- molybdenum is bottleneck, which restricts the improvement of the Cu-Mo separation technology. This paper study the Dexing copper-molybdenum flotation separation by using a new small molecule inhibitors named pseudothiohydantoin(DLC) and single-factor experiments were employed to confirmed the system of reagent. Test results indicate that DLC can make a high inhibit effect with a low consumption. Eventually, use close circuit tests to verify the inhibitor’s ability and the technical indexes such as the grade of Mo concentrate 26.17% and the recovery 89.83% are obtained by use of one time of roughing, one time of scavenging and two times of cleaning.
Numerical Simulation Study on Local Enhanced Heat Transfer for High Temperature Heat Pipe Heat Exchanger
Authors: Sun Shi Mei , Zhou Jing Min
Published: December 2011

A High Temperature Heat Pipe Heat Exchanger Consists of Heat Pipes Filled with Different Working Media inside. in Different Temperature Zones, Heat Pipes with Different Working Media Are Linked Safely by Controlling the Vapor Temperature, the Media inside the Heat Pipe. the Vapor Temperature inside the Pipe Is Heavily Affected by the Temperature Field of Fluid outside the Heat Pipes and the Heat Transfer Performance inside the Heat Pipe, while the Heat Transfer Performance inside the Pipe in Turn Has a Bearing on the Temperature Distribution of Fluid outside the Pipe. to Coordinate the Fluid Temperature Distribution both inside and outside the Pipes, Study on Local Heat Transfer Enhancement Has Been Conducted on High Temperature Heat Pipe Heat Exchanger in this Article, and Cfd Computational Software Was Used to Make Rational and Accurate Prediction of Fluid Temperature Distribution both inside and outside the Pipes, so as to Provide Economic and Reliable Design Basis for High Temperature Heat Pipe Heat Exchanger.
Liquid-Liquid Equilibria for Geraniol in Aqueous Alcohol Mixtures
Authors: Li Heng De , Zhang Tian Fei , Yan Yan , Chen Lin , Hu Ling Ling
Published: December 2011

Liquid-liquid equilibrium tie-line data were examined for ternary mixtures of (water + methanol + geraniol) and (water + ethanol + geraniol) at 298.15 K. The distribution ratios of alcohol between organic and aqueous phases are discussed. The immiscible area of (water + methanol + geraniol) system is wider than that for the ethanol system. The experimental liquid–liquid equilibrium data have been satisfactorily represented by using an extended UNIQUAC model.
Thermodynamic Analysis of an Ammonia Synthesis Process Based on Brayton Cycle
Authors: Bie Yu , Hu Ming Fu , Zhang Xu , Zhu Xiao Qin , Chang Jing Hua , Mao Wen Yuan
Published: December 2011

The paper develops a new ammonia synthesis process based on Brayton cycle, successfully solving the problem of low heat recovery efficiency of reaction heat by conventional Rankine cycle. In the new process, a gas turbine expander is introduced to drive the multistage compressor coaxially instead of raising steam in a waste heat boiler to drive a steam turbine. Such a process represents a typical reaction-separation system with a recycle stream and cold separation of the product from the recycle loop. Through thermodynamic analysis, it is found that the ammonia synthesis system has the innate convenience and conditions to use the actual improved Brayton cycle. Moreover, since the cold separation is always influenced by gas-liquid equilibrium of pure ammonia, absorption separation is integrated in the process to achieve better use of the reaction heat, which can be driven by the low temperature heat. Flow sheets of the new process are described with the pressure and temperature parameters according to the actual operation conditions. For this special case, thermodynamic calculation and analysis are carried out by a software. The calculated results show that the expansion work is much larger than the required compression work. Even if the utilization efficiency is relatively low, the output work can meet the need of gases compression.
Synthesis and Crystal Structure of the Cobalt (II) Complex Constructed from 2,2'-Bibenzimidazole and 5-Nitroisophthalic Acid
Authors: Yang Yan , Yan Liu Ting , Li Xiao , Qin Rong Huan , Duan Wen Gui
Published: December 2011

The Cobalt (II) Complex constructed with 5-nitroisophthalic acid and 2,2’-bibenzimidazole, [Co(H2bibim)3](5-nipa)•H2O (1), (H2bibim =2,2’-bibenzimidazole, 5-nipa=5-nitroisophthalic acid) have been synthesized by hydrothermal methods and structurally characterized by elemental analysis, IR and X-ray single crystal diffraction. Complex 1 possesses distorted CoN6 octahedrals linked by the H2bibim ligands in a bidentate chelating mode and the 5-nitroisophthalic acid groups act as counterions, and there exists a 2D supramolecular network linked by intermolecular O−H•••O and N−H•••O hydrogen-bonding interactions.
The Hydrogen Network Optimization of a Complex Refinery
Authors: Li Hao , Liu Gui Lian
Published: December 2011

In this paper, the hydrogen distribution network of a complex refinery is optimized by the hydrogen surplus pinch method. By plotting the hydrogen purity profiles and hydrogen surplus diagrams, the hydrogen pinch with hydrogen purity of 87% is identified. The corresponding minimum hydrogen utility consumption is 17730.5 Nm3/h. Moreover, the optimal hydrogen distribution network with minimum utility consumption is designed. Compared with the current hydrogen network, the hydrogen utility consumption can be reduced by 10.45%.
Isobaric Vapor-Liquid Equilibria of Hexamethyl Disiloxane + Ethyl Acetate System at Normal Pressure
Authors: Zhang Wen Lin , Meng Nan , Sun Ru Yi , Li Chun Li
Published: December 2011

Vapor-liquid equilibrium data of hexamethyl disiloxane + ethyl acetate system at 101.3kPa were measured by using double circulating vapor-liquid equilibrium still. The thermodynamic consistency of the VLE data was examined by Herrington method. Experimental data was correlated by NRTL and UNIQUAC parameter models. Both of the models satisfactorily correlated with the VLE data. The result showed that the NRTL model was the most suitable one to represent experimental data satisfactorily and the system had a minimum temperature azeotrope at 350.31 K and the mole azeotropic composition was 0.0330.
Correlation and Prediction of Vapor-Liquid Equilibrium for the Propylene Oxide-Ethanol-Water Ternary System
Authors: Wang Cheng Xue , Jiang Rui Xia
Published: December 2011

The vapor-liquid equilibrium (VLE) data for the binary systems ethanol-water (1), propylene oxide (PO)-ethanol (2), PO-water (3) and the ternary system PO-ethanol-water (4) were determined at 101.3kPa. The binary VLE data measured passed the thermodynamic consistency verification. The experimental VLE data of the binary systems were correlated with the nonrandom two-liquid (NRTL) models. The results show that the values of molar fraction of the ternary system (4) in vapor phase from the binary NRTL parameters agree well with the experimental data.
A Novel Application of Vehicle Security by Infrared Camera and Coating Technology
Authors: Shieh Jen Yu , Hsieh Ji Sheng , Lin Chih Ming , Lee Yueh Hsun
Published: December 2011

In the paper, a novel method is proposed for application of vehicle security by infrared camera and coating technology. In this Vehicle Security System (VSS), the traditional mirror is coated on the surface with special material by multi-layers, then, an infrared camera is placed behind the mirror on the bottom of device. In order to obtain the image, a wireless communication is integrated on this system. Therefore, the user can easily inspect the object under the vehicle. By using this infrared photography, it provides completely imaging for the total dark condition, to examine the under-vehicle area of an object or explosives. Experiments show that the proposed device reflected 80% of visible light and penetrated 20% of incident light, about 96% infrared light pass through the mirror.
Microseismic Monitoring System Establishment and its Application to Xinzhangzi Coal Mine
Authors: Duan Dong , Tang Chun An , Feng Xiao Jing
Published: December 2011

Microseismic monitoring technology is the important method for safety monitoring of coal mine. The Xinzhuangzi coal mine is high gas and outburst mine, in order to ensure safety in process of mining and tunneling, the microseismic monitoring system is built. Waveform analysis database of microseismic information and interference signal is built, the results of microseismic monitoring is preliminary analyzed. The results showed that microseismic monitoring system is stable and reliable, and the results are accurate. Microseismic monitoring technology provides a new monitoring tool and method for coal mining.
A Novel Method for Preparation of Antimicrobial Cellulose Textile by Surface Carbamatization and N-Chlorination
Authors: Wang Liu Yang , Wang Fang Ying , Wang Biao Bing
Published: December 2011

Surface carbamatization of cellulose fabric was accomplished through co-heating with urea. The carbamate group on textile surface was transformed to N-chlorocarbamate after exposure to sodium hypochlorite solution. Effect of carbamatization temperature, time on Nitrogen content of fabrics was investigated, and the effect of bleach technology on chlorine content on fabrics was also studied. Using shake flask method antimicrobial activities against E. coli and S. aureus were studied. The results showed that when carbamatization temperature was 138°C and the time was 3 hours, nitrogen content of cellulose fabric was the highest: 1.47%. Antibacterial ability of cellulose fabrics with 0.81mg/g chlorine against E. coli and S. aureus was 99.9999% and 100%, respectively.
Synthesis and Properties of a New Photochromic Compound Bearing Isoxazol Moiety
Authors: Tong Zhi Peng , Pu Shou Zhi , Cui Shi Qiang
Published: December 2011

A new unsymmetrical photochromic diarylethene, 1-(2,4-dimethyl-3-isoxazol)-2-[2-methyl-5-(3- formyl-4- methoxyl)-3-thienyl]perfluorocyclopentene (1a) was synthesized, its photochromic properties were examined, the result indicated that the Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 538 and 541 nm in methanol and PMMA film, respectively. In methanol solution, the open-ring isomer of the diarylethene 1 exhibited relatively fluorescence at 501 nm when excited at 305 nm.
Synthesis and Adsorption Properties of Ethylenediamine Modified Chitosan/Nano-Iron Magnetic Microspheres
Authors: Hu Si Qian , Wang Hai Ping , Chen Yu Hong , Liu Pei
Published: December 2011

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.
Study on Properties of Cottonseed Protein Plastics
Authors: Chen Yan Ru , Chen Xue Jiao , Wang Chang Song
Published: December 2011

With a view to research cottonseed protein in application of material field, cottonseed protein was used with glutaraldehyde to take place a crosslinking reaction, montmorillnite in nanometer level was also added to the reaction system, to manufacture a kind of cottonseed protein plastic with high mechanical properties and low water absorption. Influences of molding temperature, content of glutaraldehyde and montmorillnite to mechanical properties and water absorption were studied. Plastic samples were analyzed by X-ray diffraction and SEM surface topography. When the mass content of glutaraldehyde and montmorillnite to cottonseed protein is 30%, 6% respectively, the tensile strength and water absorption of cottonseed protein plastic is 19.1MPa, 27.8% respectively.
Study on Photocatalysis Degradation of Phenol by Using Tourmaline/ TiO2 System as Catalyst
Authors: Liu Lai Bao , He Deng Liang , Zhao Dong Mei
Published: December 2011

The authors use the method of titanium salts on the surface of tourmaline particles hydrolyzing and coating TiO2 to construct Tourmaline/ TiO2 system in different conditions and characterize the catalyst system by TEM and SEM and Raman Spectra Pattern. The writers used phenol solution as the target compound to observe the removing effects of catalysis system on phenol under dynamic conditions. The results showed that: a. the compound photo catalysis system had brilliant decomposition performance on phenol. b. It would reach high decomposition efficiency on the initial phase of reaction when the rate of tourmaline to TiO2 was 1:1 and the decomposition efficiency could be 96.29% at 120min when the rate was 0.2, which was 26% higher than that of pure phase TiO2.
Microwave-Assisted Synthesis of Corn Starch-Graft-Poly(AM-DADMAC)
Authors: Wang Guang Hua , Liu Qi , Li Wen Bing , Chen Yuan , Liu Ying Meng , Liu Wen Min , Long Mei , Huang Ting Ting
Published: December 2011

Under conditions of microwave radiation (MW) and open-vessel reflux, acrylamide (AM) and diallyldimethylammonium chloride (DADMAC) were grafted to corn starch (St) by aqueous solution polymerization in air atmosphere. Continuous MW in conjunction with potassium persulfate (KPS) were utilized to initiate the above graft reaction. A representative copolymer of St-graft-poly(AM-DADMAC) was characterized by Fourier transform infrared spectroscopy, elemental analysis, scanning electron microscopy and energy disperse spectroscopy. Microwave power, radiation time, KPS concentration and AM/DADMAC molar ratio were investigated to examine their effects on grafting efficiency (GE) and cationic degree (CD). The optimal conditions under investigation were microwave power 500 W, radiation time 150 s, KPS concentration 2 mmol·L–1, AM/DADMAC molar ratio 9∶1. The GE and CD obtained were 68.6% and 0.16 mmol·g–1, respectively.
Research on the Performance of an Eco-Friendly Nitrogen Organic Boric Acid Ester Antirust Additive
Authors: Yang Hong Gang , Zhang Jia , Ye Meng
Published: December 2011

Nitrogen organic boric acid ester was synthesized by hydroxymethylation BTA and oleic acid polyacrylamide boric acid ester two ethanol. Results showed that all of the capabilities were good when the synthesis of product’s additive quantity was 0.25%, and antirust properties kept well under a little higher temperatures and longer working-time. The product could be used as anti-rust and lubricating additives for water-based cutting fluid.
Study on the Synthesis and Characterization of a Novel Phosphorus-Nitrogen Containing Intumescent Flame Retardant
Authors: You Li Hua , Hui Yin Yin , Shi Xiang Ning , Peng Zhi Han
Published: December 2011

In this study, a novel phosphorus-nitrogen containing intumescent flame retardant (P-N IFR) poly(melamine 2-carboxyethyl(phenyl) phosphate)(PMCEP) was prepared via the reaction of 2-carboxyethyl (phenyl) phosphinic acid (CEPPA) and melamine (MEL) in two-steps. Meanwhile, the molecular structure of the chemical compound was determined by FTIR,1H-NMR and elemental analysis; and the thermal properties was investigated by means of TGA. Combustion studies revealed high limiting oxygen index (LOI) indicative of better flame-retardancy properties for PBT resin.