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Current Issue
2006 Vol.23 Issue.1,
Published 2006-01-15
Article
Article
1
Preparation of Methyl Acetate by Slurry Catalytic Distillation Process
QU Yu-xia,CAI Wang-feng,XU Chun-jian,WANG Hui,ZHOU Ming
In this paper,a new catalytic distillation process is studied on the production of methyl acetate from methanol and glacial acetic acid.The experiments were carried out in a glass column with an inner diameter of 76 mm.In the column,the rectifying section is filled with θ rings and the reactive section is composed of sieve plates to ensure high liquid holdups.The catalyst is fine particles of about 4 μm in diameter and forms slurry with glacial acetic acid.The effects of catalyst concentration,feed composition,total feed and reflux ratio on the conversion ratio are experimentally studied.The experimental results show that the conversion and the purity of methyl acetate in the distillate can reach 86.4% and 92.95%,respectively.
2006 Vol. 23 (1): 1-5 [
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1861
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187KB] (
2722
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6
Biodesulfurization of Fuel Oils
WANG Hui-fang,CAIYIN Qinggele,ZHANG Yan,JIA Xiao-qiang,WEN Jian-ping,HU Zong-ding
An organism,identified as Rhodococcus sp.EBT-2,was isolated from the slurry in Dagang Oil Field of Tianjin,China.Analysis of HPLC revealed that EBT-2 could desulfurize DBT to 2-hydroxybiphenyl(2-HBP) selectively.Furthermore,the effects of temperature,initial pH,carbon source and nitrate source on the growth and capacity of removal DBT were investigated.Results showed that the suitable inital pH is 7.5,temperature is 30 ℃,the best carbon source and nitrate source are glucose and ammonium chloride.Under optimum operating conditions,DBT of 0.25 mmol/L was degraded to 0.03 mmol/L by growing cells of EBT-2 within 48 h,simultaneously producing 2-HBP of 0.19 mmol/L.
2006 Vol. 23 (1): 6-9 [
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1841
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264KB] (
1726
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10
Electrolytic Treating of the Plating Wastewater
ZHANG Jing~1,JIANG Bin~
In this article,the plating wastewater containing heavy metal ions was electrolyzed in a novel organic glass reactor which was first designed by the author.On the basis of the experiment,the importance of slecting electrode material was discussed.And the influencing factors,such as pH,the space between eletrodes,electrode coupled manner,on removal rate were studied.The optimum conditions of the experiment have been determined.
2006 Vol. 23 (1): 10-13 [
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2005
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309KB] (
2829
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14
Synthesis and Thermodynamic Stability of Metal Complexes of 2-Mercaptopyridine
LU Lian-ying,WANG Dun-jia,YU Zhong-shan
In this paper,2-mercaptopridine based Pb(Ⅱ),Co(Ⅱ),Mn(Ⅱ),Zn(Ⅱ),Cd(Ⅱ),Cu(Ⅱ),Ni(Ⅱ) complexes are synthesized.The complexes are characterized by titration analysis,conductance measurement,UR and IR.The analysis shows that with different metal ions,the ratio of metal to ligand is different.The thermodynamic stability are obtained from the analysis of the TG/DTA,and their sequence are Pb(Ⅱ) complexes>Zn(Ⅱ)complexes>Cd(Ⅱ)complexes>Ni(Ⅱ)complexes>Co(Ⅱ)complexes>Mn(Ⅱ)complexes>Cu(Ⅱ)complexes.
2006 Vol. 23 (1): 14-17 [
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1885
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165KB] (
3634
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18
Synthesis and Application of NaY Zeolite from Coal-Bearing Kaolin
WU Jie,QIN Yong-ning,MA Zhi,LUO Yong-kang,QI Xiao-zhou
NaY zeolites with nanosize and normal size were successfully synthesized through different ways.The X-ray diffraction and TEM results indicated that the crystal zeolite product had an average size under 100 nm.Fluid catalytic cracking(FCC) catalysts was prepared respectively from the two zeolites.FCC test results showed that compared with catalyst containing conventionally hydrothermal synthesized NaY zeolite,catalyst containing nanosized zeolite exhibited good big molecule cracking performance and excellent selectivity.
2006 Vol. 23 (1): 18-20 [
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1734
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169KB] (
2807
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21
Epoxidation of Methylallyl Chloride with Hydrogen Peroxide Catalyzed by TS-1
YIN Yue-guang,CHEN Xiao-yun,MI Zhen-tao
Epoxidation of methylallyl chloride(MAC)with 30%(wt)dilute H_2O_2 solution as oxidant over TS-1 is investigated in this paper.Effects of many factors such as solvent and its dosage,temperature,the mole ratio of the reactants(MAC∶H_2O_2),and TS-1 concentration on epoxidation are considered.The results showed that methanol is the proper solvent and the appropriate volume is 80 mL.With the increase of TS-1 concentration and the temperature,the conversion,the yield and H_2O_2 utilization are improved,while the selectivity decreased.If the conversion and H_2O_2 utilization are considered,it is best for epoxidation when the mole ratio of the reactants is 1∶1 under conditions of the experiment.
2006 Vol. 23 (1): 21-24 [
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1697
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245KB] (
2480
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25
Clean Synthesis of 1,6-Dicarbamate Hexane
LU Ling,KANG Shi-fang,LI Guo-bing
The clean synthesis of 1,6-dicarbamate hexane(HDC) from dimethyl carbonate(DMC) and 1,6-diamine hexane(HDA) is studied.The preparation of HDC using different catalysts is studied,and the activity of MgO/ZrO_2 is regarded better.After characterization of the catalyst,the activity of MgO in disperse phase is inferred higher than that of MgO in crystal phase.The quantitative analysis of HDC is carried out by HPLC analysis and the influence of different reaction conditions has been investigated.
2006 Vol. 23 (1): 25-28 [
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2117
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29
Synthesis of 4-[2-(benzoyloxy)ethyl]-3-chloro-1,3-dihydro-2H-indolin-2-one,an Intermidiate of Ropinirole
WANG Jin-gang,WANG Song-qing,ZENG Guo
Isochroman was synthesized from phenyl ethanol by inner molecular Friedel-Crafts alkylation reaction.The intermidiate of Ropinirole 4-[2-(benzoyloxy)ethyl]-3-chloro-1,3-dihydro-2H-indolin-2-one was prepared from isochroman by ring opening,salt formation,hydrolysis,nitrostyrene formation and Royer reaction.The target product was confirmed by the analysis of TLC,()~(1)H-NMR,IR.The total yield is 31.51%.
2006 Vol. 23 (1): 29-32 [
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2383
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239KB] (
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33
Synthesis and Catalytic Activity of Bi-MCM-41 Molecular Sieves with Different Silica Source
SU Jian-feng,CHEN Xiao-hui,WEI Ke-mei
Bi-MCM-41 with different silica source were synthesized by hydrothermal method with(Na_2SiO_3·9H_2O),TEOS and colloidal silica as silica source,cetyltrimethylammonium bromide as template,(Bi(NO_3)_3·5H_2O) as metal source,and oxidation of styrene with hydrogen peroxide to benzaldehyde was investigated.The nature of the catalysts was discussed based on the characterization results of XRD and UV-Vis.It was indicated that the samples with(Na_2SiO_3·9H_2O) and TEOS as silica soucre had high ordering structures and Bismuth was highly dispersed in the mesostructure frameworks.Bi-MCM-41 was found to have good catalytivity in the oxidation of styrene to benzaldehyde with hydrogen peroxide as oxidant and methanol as solvent.The influence of different silica source on the oxidation activity of Bi-MCM-41 had also been discussed.
2006 Vol. 23 (1): 33-36 [
Abstract
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1970
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190KB] (
2651
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37
Purification and Purity Determination of Antioxidant BHT
WEI Bo-rong,CHEN Qing,BAO De-jun,YIN De-zhong
In order to improve the purity of industrial product,Antioxidant BHT was purified by the methods of recrystalize and zone melting.The purity was determined by high performance liquid chromatography(HPLC) and differential scanning calorimetry(DSC).The purity tested by HPLC is 99.09% with relative standard deviation(RSD) of 0.08%,tested from the way of standard curve.The purity tested by DSC is 99.16% with RSD of 0.14%.This purified antioxidant BHT reaches the same level of international product.
2006 Vol. 23 (1): 37-40 [
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1782
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307KB] (
2887
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41
Preparation of Metal Oxide Composite Conductive Powder
LI Xiang-gao,ZHANG Yi,HE Li-li,WANG Wen-bao
Composite conductive powder was prepared by the chemical coprecipitation of SnO_2 and Sb_2O_3 on TiO_2 powder.The effects on the characterization of the conductive powder were studied in preparing process.The result showed that the powder's volumetric electric resistivity is 76.14 Ω·cm and the size of conductive powder ≤1.5 μm,when the molar ratio of TiO_2,SnCl_4 and SbCl_3 is 54.0∶7.5∶1.0,pH value of hydrolysis solution is 1.5,hydrolysis temperature is 50.0 ℃ and calcinations temperature is 700.0 ℃.
2006 Vol. 23 (1): 41-44 [
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3368
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175KB] (
2904
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45
Preparation and Characterization of Nanometer Magnetite
ZHANG Xin,LI Xin-gang,JIANG Bin
In this work,nanometer magnetite(Fe_3O_4) particles were prepared by chemical co-precipitation,NH_3·H_2O was chosen as precipitating agent,and was added to the mixed aqueous solution containing ferric and ferrous ions to produce nanometer Fe_3O_4 particles.Some influence factors on the size and characteristic of the product were investigated,and preliminary characterization was also performed.
2006 Vol. 23 (1): 45-48 [
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4118
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255KB] (
5682
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49
Characterization of Physicochemical Properties of Deactivated Particulate Clay Used in Aromatic Hydrocarbon Refining and Its Regeneration
SUN Xu-jiang~
Particulate clay is commonly applied in the refining of aromatic hydrocarbon,and it will deactivate after a period of use.In this study,deactivated particulate clay was characterized by means of BET,TG,TPO,UV-Vis,XRD,and NH_3-TPD,and the mechanisms of deactivation were analysed.Because it was of acidic,the particulate clay catalysed olefins to polymerize each other or alkylate with aromatic hydrocarbon,and larger molecules formed.When these larger molecules were not removed by aromatic hydrocarbon fluid,they would overlay the surface of particle clay,and occupy the pores of particle clay.Thus,the number of acidic sites as Well as the specific surface of particle clay decreased,and the particulate clay deactivated gradually.Owing to lower reaction temperature in the aromatic hydrocarbon refining,the phase of particulate clay did not change after deactivation,and so the phase had no relation with the deactivation of particulate clay.By the oxidation with air under the proper temperature,the deactivated particle clay restored its specific surface area,pore volume,and activity to a great extent.
2006 Vol. 23 (1): 49-51 [
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3454
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176KB] (
2741
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52
Large Eddy Simulation of Gas-Liquid Flow in a Partially Aerated Bubble Column Reactor
ZHANG Jin-li,LI Xiao-fang,BAO Jia-kun,LI Wei
The large eddy simulations(LES) with the Euler-Euler approach is used to study the gas-liquid flow in a partially aerated bubble column.The LES results shows that the bubble swarm motion and gas hold-up distribution agree well with the experiment results.And the process of gas-liquid turbulence transient structures formation and evolvement has been captured through the simulation.Effects of different parameters on the vortex structures are as follows:increasing the gas velocity intensifies the change of the vortex structures,increasing the liquid viscosity inhibits the development of the vortex scale,decreasing the column aspect ratio reduces the quantity of the vortexes.
2006 Vol. 23 (1): 52-58 [
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1635
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575KB] (
1679
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59
Applications of Magnetization Technology in the Treatment of Industrial Wastewater
JIA Liang,LI Zhen,JIA Shao-yi
Magnetization technology is a newly arisen technology.Applying the magnetization technology in the processing of industrial wastewater is a popular research topic in recent years.The more detailed introduction and comments are given in this paper to the technology of magnetic treatment of industrial wastewater and its applications in recent years,through introducing the principle and classification of technology of magnetic separation,property of magnetic water and characterstics of magnetic separation.
2006 Vol. 23 (1): 59-64 [
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2662
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311KB] (
4062
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65
Progress in Microstructure of Superfine Particles and Their Clusters Under External Forces
CHANG Qing,SHEN Qin,LI Jing-sheng
This article describes current progress in microstructures and their clusters of superfine particles home and abroad.Those features include system static-structure properties,i.e radical distribution function,fractal dimension,coordination number etc,and system dynamic properties,i.e aggregating mechanism of superfine particles under external forces in fluid.Finally,the development prospect in microstructures of superfine particles has also been discussed.
2006 Vol. 23 (1): 65-69 [
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4572
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199KB] (
2206
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70
Advances in Catalysts of Aldol Condensation
TAN Lu-lu,QIAN Jun-lü,WU Yan-hui
Aldol condensation is an important organic reaction which leads to the formation of new C-C bond.The desired yield can not been easily achieved because this reaction is always accompanied by a series of side reactions.It's predominant to select a proper catalyst in order to industrialize this reaction.In this paper,three kinds of catalysts are introduced and discussed according to the acid or base active site.The prospect of the catalysts for aldol condensation is also been put forward.
2006 Vol. 23 (1): 70-74 [
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9437
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75
Packings and Liquid Distributor in Packed Column
XU Shi-min~
Present situation of packed column technology at home and abroad is summarized,including the structure characteristics of some new packings,random packing and structured packing,and liquid distributors developed in recent years.Successful industrial application of some packed column technologies developed by Tianjin University,Tianjin,China,was also introduced.Finally,The orientation of technical development of packed column is put forward.
2006 Vol. 23 (1): 75-80 [
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4687
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257KB] (
3703
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81
Development of Super-Hydrophobic Coatings
DUAN Hui~
In this paper,the basic principles of super-hydrophobic surfaces are outlined from two aspects by introducing materials of low surface energy and rough surface of coatings respectively.The preparation technology and the new development of super-hydrophobic coatings are reviewed,and application of super-hydrophobic coatings is proposed.
2006 Vol. 23 (1): 81-87 [
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9038
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247KB] (
8294
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88
Synthesis of New Anti-Hypertensive Drug of Amlodipine
LIU He-chao,FENG Ya-qing
In this paper,various synthesizing method,medical mechanism,productive situation at home and abroad of amlodipine are reviewed.The key step in the synthesis of amlodipine,cyclization of the 1,4-dihydropyridine by Michael addition reaction and Hantzsch reaction in which different amine protective groups were used,are illustrated in details.By comparing the advantages and disadvantages of the two different processes,the feasibilities of industrial application is discussed.
2006 Vol. 23 (1): 88-92 [
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4571
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241KB] (
3064
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93
Synthesis of Diisopropyl Succinate Catalyzed by p-Methyl Benzenesulfonic Acid
SONG Xiu-juan~1,QIN Zhi-zhong~2,ZHANG Guo-liang~1,ZHANG Feng-bao~1
Diisopropyl succinate was synthesized from succinic acid and isopropanol with p-methyl benzenesulfonic acid as catalyst.The effects of reaction time,feeds mole ratio,and the amount of catalyst used in the esterification on the yield were discussed.The optimum reaction conditions were determined,and the yield under these conditions reaches 96.5%.
2006 Vol. 23 (1): 93-95 [
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2088
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213KB] (
2837
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