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Current Issue
2011 Vol.28 Issue.3,
Published 2011-05-15
Article
Article
1
Isomerization of αPinene over Magnetic NanoSolid Superacid SO2-4/TiO2Fe3O4 Catalysts
WU Chun-Hua, ZHU Dan-Dan, DAI Xue-Yu, LI Chao-He
In order to increase the separation of nanosolid superacid from liquid product, magnetic nanosolid superacid SO2-4/TiO2Fe3O4 catalysts were prepared. The transmission electron microscopy (TEM), Xray diffraction spectra (XRD), infrared spectroscopy (IR) were used to characterize the structure of catalyst. The performance of the catalyst was investigated by isomerization reaction of αpinene. By using single factor method and orthogonal test methods, the best processing conditions of the isomerization of αpinene is obtained: reaction temperature is 120 ℃, the amount of catalyst is 2%, reaction time is 2 h. Under these processing conditions, the conversion of αpinene is 921% and the selectivity of camphene is 5896%.
2011 Vol. 28 (3): 1-4 [
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2677
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204KB] (
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5
Oxidative Desulfurization of Gasoline Model Compounds over Supported Phosphotungstic Acid Catalysts
TIAN Wei-Wei, LI Hui-Peng, ZHAO Hua
The phosphotungstic acid (HPWA) was loaded on the HY molecular sieve by impregnation method and the oxidative desulfurization of FCC simulation gasoline was investigated with thiophene solution as model compound by this loaded catalyst. The effects of reaction temperature，catalyst loading amount, reaction time, catalyst amount and oxidant amount on desulfurization were studied. The results show that with the loaded phosphotungstic acid as catalyst, tetrabutyl ammonium bromide as phase transfer catalyst, reaction temperature 40 ℃, reaction time 150 min, the oxidant amount n(H2O2)/n(S)=8, dimethyl sulfoxide as extractant, the desulfurization rate of thiophene is up to 9289%. The sulfur content of model compound dropped to 36 μg/g after reaction, which meets the requirements of the standard. This method can be used to produce low sulfur gasoline.
2011 Vol. 28 (3): 5-8 [
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2516
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346KB] (
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9
Preparation of Silver Plated Copper Electromagnetic Shielding Waterborne Coatings and Its Property
LI Tao-an，MAO Qian-jin，ZHENG Fu-ying，CUI Su-ping，LAN Ming-zhang，WANG Zi-ming，WANG Ya-li
Electromagnetic shielding waterborne coatings was developed, with acrylic emulsion and silver plated copper powder as main raw material, wetting agent, dispersing agent, defoamer, leveling agent and water as additives. The process of coating preparation is as following: first,wetting agent, dispersing agent, first part of defoamer and silver plated copper were mixed, then emulsion was added and stired for some time, lastly leveling agent and the rest of defoamer were put into to obtain electromagnetic shielding coatings.The effects of the content of silver plated copper powder, water, and different emulsion on the conductivity and electromagnetic shielding property were discussed by conductive mechanism，electromagnetic shielding theory and the microcosmic structure of coatings. The shielding efficiency of the electromagnetic shielding waterborne coatings is 55—65 dB at range of frequency 100 kHz—15 GHz.
2011 Vol. 28 (3): 9-13 [
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1720
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215KB] (
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14
Synthesis and Characterization of OilSoluble Drag Reduction Agent by Ternary Polymerization
RAN Chong-wen，GUAN Min, LI Hui-ping
It is an effective way to increase transmission capacity of pipelines by adding drag reduction agent in oil of pipeline. Drag reduction agent was synthesized by bulk polymerization using ZiegleNatta catalysts and mixed 1octene/1decene/1dodecene as monomers, drag reducing efficiency was evaluated by the simulative loop evaluation apparatus. The intrinsic viscosity of polymer was measured by the Ubbelodhe viscometer, and according MarkHouwink equation the viscosityaverage molecular weight was calculated as 6 629 759 Orthogonal experiment was used to determine the synthetic conditions of polymers, the optimum technological conditions were as following: V(1octene)∶V(1decene)∶V(1dodecene)=1∶4∶5, dosage of TiCl4/MgCl2 was 015 g, TIBA was 15 mL, and the drag reducing efficiency of the ploymers was 5325％. The prepared polymer was characterized by IR, XRD,1HNMR, and the results show that the polymer is well polymerized and has industrial value.
2011 Vol. 28 (3): 14-19 [
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1886
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288KB] (
2957
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20
Hydrogenation Process of Silicontetrachloride on Fixed Bed
ONG Jia1, CAO Zu-bin2, LI Hui-peng2, HAN Dong-yun2, LI Da-wei2
Hydrogenation process of silicontetrachloride on fixed bed was investigated, and the effects of temperature, pressure, mole ratio of hydrogen to silicontetrachloride, mass ratio of catalyst to silicon on the conversion were discussed. Compared with fluidized bed, this method can reduce powder blockage and catalyst loss, and bring significant benefit for enterprises. The optimal operating conditions are: temperature of 500 ℃, pressure of 35 MPa, mole ratio of hydrogen to silicontetrachloride 50, mass ratio of catalyst to silicon 0100.
2011 Vol. 28 (3): 20-24 [
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8989
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25
Activity Coefficient Measurement of NaBr, NaCl and KBr in Selected Organic Solvents
JIANG Bo, WANG Li-sheng, LI Mi-yi
In this paper, the conductivities of NaBr in methanol, ethanol, 1propanol, 2propanol, NaCl and KBr in methanol, ethanol system (solution concentration within 01 mol·L-1) were determined at 29815 K, 31315 K and 32315 K at atmosphere pressure respectively. The mean ion activity coefficients of NaBr, NaCl and KBr in various organic solvents were calculated according to DebyeHücker limiting law and OnsagerFalkenhangen equations. The effects of concentration and temperature on activity coefficients of electrolyte solutions were discussed. The calculated results were compared with those of NaBr in ethanol, NaCl in methanol and KBr in methanol reported in literature. The results show that the experimental data obtained by conductivity method have good agreement with data in literature.
2011 Vol. 28 (3): 25-32 [
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9525
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33
Kinetics of Photoisomerization of Norbornadiene
GU Ling, LIU Wei, LI Wei-hua
The kinetics of the photoisomerization of norbornadiene in the circulation reactor was investigated in the absence of solvent, with norbornadiene as raw materials and with 4,4’bis(diethylamino) benzophenone as the triplet sensitizer. The results show that the concentration of norbornadiene drops quickly in the earlier stage, while it drops slowly in the later stage. The reaction rate can be expressed with a firstorder reaction kinetics equation. The activation energy is 29 173 J/mol and the preexponential factor is 1026 min-1.
2011 Vol. 28 (3): 33-36 [
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4605
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37
Determination of CMC of Tween20/40 and Effect of NaCl on Viscosity
WANG Xin-hong, DAI Jing-tao
In this paper, by using iodine in the solution as colourdisplay reagent, critical micelle concentration(CMC) of nonionic surfactant Tween20/40 were investigated by ultraviolet absorption spectrophotometry,which were 519×10-5 mol/L and 190×10-5 mol/L,respectively. CMC of surfactants Tween20/40 by viscosity method were 500×10-5 mol/L and 193×10-5 mol/L, and the effect of different NaCl concentrations on CMC and viscosity were studied.Results showed that CMC determined by spectrophotometric method was closely agreed with that in literature.The solutions relative viscosity has a tendency of droping with increasing NaCl, while CMC values remain unchanged. For constant NaCl, relative viscosity increases at first and then keep constant when CMC is reached.
2011 Vol. 28 (3): 37-40 [
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2570
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41
Extraction Technology of Alkaloids from Capsella bursapastoris
LIU Chun-feng
The extraction technology of alkaloids from Capsella bursapastoris by Soxhlet extraction method was introduced in this paper. Firstly, the influence of extraction time, the volume of extraction solvent and the concentration of solvent on the yield of alkaloids from Capsella bursapastoris were investigated by single factor experiment. Then the optimum extraction condition was obtained by orthogonal experimental design: the mass of raw material Capsella bursapastoris is 20 g, extraction time is 9 h with 200 mL 90% ethanel, and yield of alkaloids is 0047%.
2011 Vol. 28 (3): 41-44 [
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2132
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3051
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45
Interaction between 4, 9di［N(2dimethylamino)ethyl］ 9Aminoacridine4Formamide and Protein
ZHANG Li-juan
Mutual combination mechanism of DNAF with bovine serum albumin (BSA) was investigated by applying watersoluble 4,9di［N(2dimethylamino) ethyl］9aminoacridine4formamide(DNAF) probe. The corresponding thermodynamic parameters ΔH, ΔG and ΔS were calculated and through fluorescence quenching method, the number of binding sites n and apparent binding constant KA were determined. The distance of donor BSA and receptor DNAF, namely r was derived based on the theory of fluorescence resonance energy transfer. The quenching mechanism of DNAF on intrinsic fluorescence quenching of protein and the types of interaction forces were proposed.
2011 Vol. 28 (3): 45-48 [
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2111
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347KB] (
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49
The Lignite Coal Pyrolysis Process Simulation Based on Aspen Plus
WANG Wei, SHANGYu-kun, WU Jian-jun
With high moisture lignite coal as an example, the method and procedure to build simplified model for coal pyrogenation process(CPD) using the chemical process simulation software Aspen Plus were introduced. Setting process of CPD model simulation parameter was given, and the Aspen Plus software was used to simulate the calculation process of coal pyrogenation, and the obtained simulation value was compared with the actual value. At the same time, the coal pyrolysis simulation process and the results were analyzed and provided basic reference to coal pyrogenation process development and optimization.
2011 Vol. 28 (3): 49-53 [
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11094
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320KB] (
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54
Numerical Simulation of the Liquid Flow on the Heat Tube Surface
ZHANG Ming, FENG Hou-jun, LV Qin-chun
In this paper, the process of the liquid flow on the heat tube surface was carried out using computational fluid dynamics (CFD) simulation method. Based on the threedimensional grid model, the flow profile and the spread morphology of the liquid on the tube surface, the film thickness distribution and the keeping time of the liquid around the tube were investigated under different density of liquid distribution. The simulated result was coordinated with the experimental work, and it will be very helpful for better understanding the liquid flow process of falling film, as well as the design and optimization of the evaporator.
2011 Vol. 28 (3): 54-57 [
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5430
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3183
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58
Brief Discussion on Design of Chlorine Dioxide Generator
YIN Chang-chun1, LIU Jing-hua2
Due to its unique performance of sterilizing, the chlorine dioxide generator has been widely used in the water treatment industry in China. In order to promote the technology and benefit the public, we would like to share our practice and experience among the industry.
2011 Vol. 28 (3): 58-61 [
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1783
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112KB] (
3283
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62
Progress in Catalytic Hydrolysis Technology of Carbon Disulfide at Low Temperature
HE Dan, YI Hong-hong, TANG Xiao-long, WANG Hong-yan, ZHAO Shun-zheng
Catalytic hydrolysis technology of carbon disulfide (CS2) at low temperature was reviewed, including the development in hydrolysis catalyst, reaction kinetics and deactivation mechanism. It was indicated that improving the alkaline of catalysts to pepare highly activated hydrolysis catalysts and removing CS2 in one step at low temperature would be the research focus in the future.
2011 Vol. 28 (3): 62-66 [
Abstract
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1971
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142KB] (
3905
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67
Technology for the Catalytic Removal of Nitrogen Oxides in the LeanBurn Exhaust of Vehicles
PAN Guang-hong, MENG Ming
Leanburn technology can not only improve fuel economic efficiency but also reduce CO2 emission. However, in leanburn exhaust, there exists excess oxygen, which accelerates the catalytic oxidation of reductants, and therefore decreasing efficiency of NOx reduction over the conventional threeway catalysts. At present, there are mainly three kinds of catalytic technology for leanburn NOx removal, namely NO direct decomposition, selective catalytic reduction (SCR) and NOx storage and reduction (NSR). In this paper, the leanburn combustion technique is briefly introduced, and the catalytic technology for leanburn NOx removal is systematically reviewed.
2011 Vol. 28 (3): 67-73 [
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8925
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5144
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74
Separation and Purification of HeatSensitive Materials by Batch Distillation
CUI Xian-Bao, ZHANG Ying, FENG Tian-Yang
Heatsensitive materials are compounds which are prone to heat damage, and the separation and purification of heatsensitive materials are difficult. Batch distillation is an important method to separate heatsensitive material. The concepts of “decomposition hazard” and “stability index”, as well as the method to evaluate the distillation equipment for separating heatsensitive material were introduced. The development of batch distillation processes and equipments for separating heatsensitive materials were reviewed, such as batch distillation with a recycled cold still pot, batch distillation with dynamic side withdrawal and batch distillation with “wetted dry still pot”.
2011 Vol. 28 (3): 74-79 [
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2806
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211KB] (
3180
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