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Table of Content
25 November 2006, Volume 25 Issue 11
    进展与述评
    Application of inorganic materials in enzyme immobilization
    HUANG Lei,CHENG Zhenmin
    2006, 25(11):  1245. 
    Abstract ( 1594 )  
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    The application of inorganic materials in enzyme immobilization in recent years is reviewed. Emphasis is given to the introduction of the pretreatment of inorganic materials before enzyme immobilization and corresponding enzyme immobilization methods. Finally,the problems that should be resolved in the present research work of inorganic supports for enzyme immobilization are discussed,and the application of inorganic materials in enzyme immobilization is prospected.
    Research and development of polymer Ni/MH battery
    TANG Zhiyuan,LI Changsheng,LIU Yuangang
    2006, 25(11):  1251. 
    Abstract ( 1574 )  
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    The characteristics and development status of polymer Ni/MH battery were presented,and several typical alkaline polymer electrolytes that have been well researched were listed. These polymer Ni/MH batteries were compared with conventional Ni/MH batteries in terms of capacity,cycling life and safety. The conductivity,cycling life and other characteristics of several electropytes were summzrized. In addition,the application prospects of polymer Ni/MH batteries were discussed.
    Preparation and applications of microencapsulation of vitamin C
    JING Legang,ZHAO Xinhuai
    2006, 25(11):  1256. 
    Abstract ( 1635 )  
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    Research progress of the preparation of microencapsulated vitamin C was reviewed. The coating materials and microencapsulation methods of vitamin C were discussed. Applications of microencapsulated vitamin C in foods,pharmaceuticals and feeds were also introduced.
    Hydrophobic stain–resistant paint
    QU Ailan,WEN Xiufang,PI Pihui,CHENG Jiang,YANG Zhuoru
    2006, 25(11):  1261. 
    Abstract ( 1620 )  
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    The stain–resistant and self–cleaning paint hass attracted great attention for its special properties. The preparation of hydrophobic and self–cleaning paint with excellent performance by combining the theories of phase–separation and “lotus–effect” with the composite method of nano and organic materials has received a lot of research attention recently. The reason of being stained easily for outdoor paint and the methods adopted usually to improve the property of stain–resistance were stated briefly. The applications of new technical methods in hydrophobic paint were introduced.
    Advances in modification of poly(β–hydroxyalkanoate)
    YAN Leping,WU Gang,WANG Yingjun
    2006, 25(11):  1266. 
    Abstract ( 1780 )  
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    The microbial poly(β–hydroxyalkanoate)(PHA)is a biodegradable and biocompatible thermoplastic polyester. It has attracted much attention as tissue engineering scaffold. But the drawbacks of the PHA restrict its wide application,such as its hydrophobicity,low bioactivity,and the difficulty in controlling its degradation. The recent modification developments of PHA are reviewed. The properties of PHA were improved after modification,which would widen its application in the fields of tissue engineering and medical materials.
    Research progress of dilute heavy metal wastewater treatment by electrodeionization technology
    LU Huixia,YAN Bo,WANG Jianyou,FU Xueqi
    2006, 25(11):  1270. 
    Abstract ( 1488 )  
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    The principle of the electrodeionization (EDI) technology was presented,the application of ion exchange medium and ion exchange membrane was reviewed,and the up-to-date research progress of resin bed,stack configuration and technical flow sheet were also summarized. Furthermore,several present models of mass transfer were analyzed,the existing problems at present and development of the EDI were also put forward for the dilute heavy metal wastewater treatment.
    A new type of environmentally-friendly and energy-saving dehumidifying
    technology——Thermoelectric cooling dehumidification
    LIANG Ting’an,XI Hongxia,LI Zhong,XIA Qibin,CHEN Jinjian
    2006, 25(11):  1276. 
    Abstract ( 1809 )  
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    The development of the traditional dehumidifying technology and its disadvantages are reviewed in this paper. The operational principle,theoretical model and recent advances of the new thermoelectric cooling dehumidifying technology are systemically introduced. Compared with the traditional dehumidifying technology,as a new type of environmentally-friendly and energy-saving dehumidifying technology,the thermoelectric cooling dehumidifying technology is expected to become more and more attractive along with the development of thermoelectric technology,and the improvement of the performance of the thermoelectric cooling dehumidifier coupled with the cost reduction of photo voltaic (PV) solar panel.

    Hydrogen production by biomass gasification in supercritical water
    WANG Qian,LI Guangming,WANG Hua
    2006, 25(11):  1288. 
    Abstract ( 1618 )  
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    Hydrogen production by biomass gasification is a promising technology,which belongs to the comprehensive utilization of agricultural wastes. The technology of biomass gasification in supercritical water is reviewed,and the effects of temperature,pressure,residence time,and reactor on the gas composition and efficiency of gasification are discussed,with emphasis on the effect of catalysts. The main problems of hydrogen production from supercritical water gasification in the utilization of organic wastes are analyzed and its trend of development is also presented.

    Progress in study of natural gas hydrate inhibitor
    XU Weixiu,LI Qijing,CHEN Guangjin
    2006, 25(11):  1289. 
    Abstract ( 1588 )  
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    The current status of study,mechanisms,varieties,application scopes and shortages of thermodynamical inhibitors,kinetic inhibitors and anti-agglomerants are presented respectively. In view of the shortages of the existing inhibitors,the development trend of the research is proposed.
    Application of pyrazolyl ligands in supramolecular self-assembly
    YU Mei,MEI Guangquan,HUANG Haiping,YU Shuyan
    2006, 25(11):  1294. 
    Abstract ( 1574 )  
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    Pyrazolyl ligand is a kind of multifunctional organic ligand. In this paper,the current development and trend of supramolecular self-assembly of monopyrazoles,dipyrazoles and multipyrazoles are discussed in detail.

    Preparation of heterogeneous chiral catalysts and their application to asymmetric hydrogenation
    WU Yue,XUE Ping
    2006, 25(11):  1301. 
    Abstract ( 2053 )  
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    The preparation of heterogeneous chiral catalysts for asymmetric hydrogenation by the immobilization of homogeneous catalysts on polymerFe3O4 nanoparticles or functionalized molecular sieves was reviewed. The interaction between the negatively charged molecular sieve framework and the cation of the organometallic complex; modification of chiral micromolecular (such as Cinchona alkaloid) and application of natural chiral biopoly mers were discussed. Their activitiesenantioselectivitiesand characteristics in asymmetric hydrogenation were also introduced.
    Review of designing ABO3 perovskite photocatalysts
    LI Honghua,WANG Hao,YAN Hui
    2006, 25(11):  1309. 
    Abstract ( 1773 )  
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    The main strategies of designing ABO3 perovskite catalysts were reviewed. The emphasis was put on (1) Selection and tuning of the band structure(2) Selection of B-site elements which principally determined the photocatalytic activity(3) Selection of A-site elements(4) Valency and vacancy controls by partial substitution of A-site or/B-site elementswhich could extremely improve the photocatalytic activityand (5) Enhancement of surface area by forming fine particles or dispersing on supportswhich could also enhance photocatalytic activity.
    Research progress of hydroquinone production techniques
    GUAN Zhenqiang,LI Dawei,LI Zhongjie,XIANG Shuguang
    2006, 25(11):  1314. 
    Abstract ( 2255 )  
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    Production techniques of hydroquinonesuch as oxidation of anilineperoxidation of p-diisopropylbenzenedecomposition of bisphenol A and hydroxylation of phenol were reviewed. Hydroxylation of phenol showed good prospect because of its advantages of good product quality and no pollution. The properties and characteristics of these catalysts including inorganic acidsinorganic saltsmolecular sievesheteropoly compounds and composite metal oxides were analyzed and compared. It was found that iron-based composite catalyst represented the trends of development because of its low price and good properties. The research progress of the formationremoval and comprehensive utilization of tarthe development of reactors of different catalysts and high activity iron-based composite catalyst in continuous stirred tank reactor were introduced.
    研究开发
    Fabrication of rough microstructured surface by surface gelation technology
    DUAN Hui,WANG Houzhi,XIONG Zhengrong,ZHAO Lei,GU Huazhi
    2006, 25(11):  1320. 
    Abstract ( 1993 )  
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    The well-proportioned composite sols were prepared by using the sol-gel technology with tetraethyl orthosilicate (TEOS) and methyl triethoxy silane (MTES) as the precursors in alcohol-soluble fluorinated polymer solution with PTFE doping under the hydrochloric acid and deficiency of water conditions. The gelation occurred on the composite coating surface after the substrate was coated with composite sols. The experimental results showed that the micrometer-scale and nanometer-scale hierarchical structures were formed by micrometer-sized PTFE particles and nanometer-sized silica particles on the coating surface. The gelation occurred just on the surface of composite coatingwhich was confirmation by XPS resultsand the morphology of coating surface was similar to a lotus leaf according to SEM observation. The super-hydrophobic coating with excellent mechanical properties could be fabricated by this technique according to different requirements.
    Synthesis of three-dimensionally ordered macroporous SiO2 by
    colloidal crystal template method
    YANG Weiya,ZHENG Jingtang
    2006, 25(11):  1324. 
    Abstract ( 1803 )  
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    Three-dimensionally ordered macroporous (3DOM) SiO2 materials were synthesized by using colloid crystal template which was assembled by centrifugation of polystyrene spheres with 480nm diameter.The sol from tetraetoxysilane was filled in the voids between spheres,and transformed into gel in-situ.The template was removed by calcination.The sample had a hexagonally well-ordered array as shown by SEM observation.The diameter of macroporores was 360 nm corresponding to a shrinkage of 25%.The macropores kept three-dimensionally interconnected macroporous networks through small windows.The walls of pores contained the mesoporous structure with a narrow pore size distribution in 3~4nm according to the result of N2 adsorption-desorption.The XRD spectrum showed that the sample consisted of amorphous SiO2.
    Synthesis of caprylic glycerides by immobilized candida sp. lipase
    SUN Meng,YIN Chunhua,CHIN Jun,CHEN Biqiang,TAN Tianwei
    2006, 25(11):  1328. 
    Abstract ( 1718 )  
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    Synthesis of caprylic glycerides from caprylic acid and glycerol catalyzed by immobilized Candida sp. lipase in a solvent-free system was studied. The influences of different lipasesmolar ratio of substratesreaction temperatureamount of immobilized lipasewater content in glycerol and reaction time on the glycerides synthesis were investigated. The optimum reaction condition was obtained by esterification from 0.69g glycerol and 2.16g caprilic acidwith 0.5g immobilized lipase at 40. In this conditionthe conversion of caprylic acid could reach 94%the immobilized Candida sp. lipase could be reused for 4 batches after simple treatment.
    Characteristics and properties of nano magnesium hydroxide prepared by
    wet precipitation method at high temperature and hydrothermal treatment
    LI Zhenzhong,LIU Jingbin,HE Wei,ZHANG Wenxiong
    2006, 25(11):  1332. 
    Abstract ( 2022 )  
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    magnesium hydroxide (MH) nanoparticles with high dispersibility were prepared by wet precipitation of magnesium chloride and sodium hydroxide at high temperatureand its shape appearance and crystallite characteristics with different hydrothermal durations were investigated with SEMXRD methods. In additionits application in ethylene vinyl acetate copolymer (EVA) was studied. The results showed that the grain of MH was hexagonal platelet-shaped and de-agglomerated powdersand the morphologydispersibilityfilter properties and its compatibility with EVA become better with increasing hydrothermal duration. The MH with 3 h hydrothermal reaction showed excellent filter propertiesgood compatibility with EVA. Its blend with EVA (50/50 wt.) had good rheological and mechanical properties with balance torque 15 N·mthe elongation at break 430%and tensile strength 11 MPa.
    Quartz sand filtration of NHD solution
    SHEN Hongyan,LIU Youzhi,GU Lei,LIU Zhenhe
    2006, 25(11):  1336. 
    Abstract ( 1926 )  
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    Quartz sand filtration was used for purifying the NHD (a decarburizing/desulfurizing reagent mainly consisting of polyethylene glycol dimethyl ether,developed by Nanjing Chemical Industry Company). The operating conditions,including operating pressure,filtration rate,quartz sand particle size,sand bed thickness were studied. The suitable conditions of quartz sand filtration using for purifying the NHD decarburizing/desulfurizing solution were studied,and sand-bed backwashing method and its intensity were determined. The experimental results showed that at room temperature,quartz sand particle size 0.60~0.80 mm,sand bed thickness 600 mm,operating pressure 0.03 MPa,filtration rate 8.1 m/h,after purification treatment of NHD solution with sand as filtration material,the solid impurities removal was up to 89.8%,and the absorption property of NHD solution remained unchanged.
    Determination of organochlorine pesticides in traditional Chinese medicine using microwave-assisted extraction
    LI Xuemei,ZHOU Wei
    2006, 25(11):  1340. 
    Abstract ( 1551 )  
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    A method to determine organochlorine pesticides in traditional Chinese medicine based on microwave-assisted extraction was studied. The organochlorine pesticides were determined with gas chromatography and electron capture detection. The result showed that the optimum setting of microwave-assisted extraction parameters were: microwave temperature 120 microwave time8.00 minmicrowave pressure 0.8 MPa. The values of recovery were 85%117%, the relative standard deviation (RSD) were 3.4%6.1% and the limit of the detection for organochlorine pesticideswas 0.001 μg·g10.005 μg·g1.
    Evaluation of extraction performance of the solvents for FCC gasoline
    deep desulfurization
    CHEN Na,ZHANG Wenlin,MI Guanjie,HOU Kaihu
    2006, 25(11):  1345. 
    Abstract ( 1624 )  
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    The extraction performance of four solvents for deep desulfurization the 70—160℃ fraction of FCC gasoline and modeling gasoline containing three sulfur compounds was investigated respectively. The extraction desulfurization performance of sulfolane was best among the solvents examined. The influences of the ratio of solvent to oil, extraction temperature and composition of the mixing solvent on extraction performance were studied. The effect of extraction temperature on the percentage of sulfur removal from FCC and modeling gasoline was not significant. The suitable extraction conditions were determined as follow: ratio of solvent to oil 3∶1 and temperature 35 ℃. The results indicated that extraction performance of sulfolane is better than that of the mixing solvent.
    Effect of ultrasound and emulsifier on preparation of diesel-water micro-emulsion
    XU Ning,SHE Jinjin,HAN Pingfang,LÜ Xiaoping
    2006, 25(11):  1349. 
    Abstract ( 1894 )  
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    Ultrasonic cavitation and mechanical effect is a helpful and effective method to prepare micro-emulsion. Cetyl trimethyl ammonium bromide (CTAB) as emulsifier and 1-butyl alcohol as co-emulsifier were used to prepare the micro-emulsion of water-in-diesel oil. The optimum ultrasonic condition to get the micro-emulsion was determined: ultrasonic frequency 40 kHz,ultrasonic intensity 0.266 W/cm2,treatment time 20 min. The effect of emulsifier on the preparation of micro-emulsion was studied. The emulsifiers Span80,Span60,ABS were chosen as compounding agent to CTAB to prepare the micro–emulsion. The optimum compounding agent was Span80. The dosage of co-emulsifier could be decreased.
    Catalysts for ethyl benzene oxydehydrogenation to styrene
    ZHANG Cheng,YU Shaobing,HAO Xiaoming,ZONG Baoning
    2006, 25(11):  1354. 
    Abstract ( 1796 )  
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    A study to use carbon dioxide as a soft oxidant and diluent in the dehydrogenation of ethylbenzene to styrene was carried out over a molecular sieve VAPO-5 supported catalyst. It was found that VAPO-5 was a kind of appropriate catalyst support,and itself showsed considerable activity. Nickel,cerium or molybdenum loaded VAPO-5 were recommended as suitable catalysts. Ni/VAPO-5 showed the highest activity,and its styrene yield was 38.5%. With the addition of alkaline earth metal megnesium or rare earth element lanthanun to the catalyst,the catalytic performance was enhanced significantly. The styrene yield of Mg/ VAPO-5 reached 44.1%.
    Oxidation of toluene catalyzed by NHPI/transition metals
    FANG Yahui,HU Anjun,LI Bindong,LÜ Chunxu
    2006, 25(11):  1358. 
    Abstract ( 1818 )  
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    Oxidation of toluene catalyzed by N–hydroxyphthalimide (NHPI)/transitions metals with molecular oxygen in the acetic acid reaction medium was reported. The effects of different M(acac)2 (M = Cu,Co,Ni,Fe,Mn) complexes on the oxidation were studied and the results showed that among theses transition metals manganese showed the highest catalytic activity. The effects of different manganese salts were also investigated,and MnCl2 had the highest activity. The reaction conditions of the oxidation process catalyzed by NHPI/ MnCl2 catalyst system were optimized. The optimum conditions were as follows:n(MnCl2)∶n(NHPI)=5×10-2,n(catalyst)∶n(toluene)=10.5%,V(acetic acid)∶V(toluene)= 1∶1,oxygen flow rate 0.05 L/min,reaction temperature 100 ℃ and reaction time 13 h. Under these conditions,61.0% benzoic acid could be obtained with 80.9% selectivity at 75.4% conversion.
    Ultrasonic extraction of resveratrol from waste residue of grape spike-stalk
    KANG Yanfang,LI Mengqing,HOU Jiangong,JU Yinxuan,LIU Guimin,LIU Songqin
    2006, 25(11):  1362. 
    Abstract ( 1787 )  
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    The ultrasonic extraction of resveratrol from grape spike-stalk waste residue was studied by separation with thin layer chromatography,The yield of resveratrol was determined by ultraviolet spectrometry. The effect of various factors such as extraction time,extraction temperature,duty ratio and solid/liquid ratio on the extraction yield of resveratrol was investigated. On the basis of single factor and orthogonal experiment,the optimum conditions were determined as follows:volume fraction 60% ethanol solution as extractive solvent,extraction time 6 min,extraction temperature 70℃,solid/liquid ratio 1∶15,the extraction yield of resveratrol could reach 0.33%.
    应用技术
    Altering hydrogenations of total effluent and net product in revamping of ethylene C2 section
    ZHAO Bairen,WANG Xinquan,LI Guanghua, DONG Yuqun
    2006, 25(11):  1366. 
    Abstract ( 1527 )  
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    In the two expansions of an ethylene plant, the C2 system of cold section was changed from the acetylene hydrogenation of the total deethanizer overhead effluent to the hydrogenation of the net C2 product in the first stage, where only a few modification of the acetylene hydrogenation, green oil absorber and ethylene drying sections was required, and then to cascade hydrogenation of both total effluent and net product in the second stage to overcome the difficulty in refrigerant services. The plant capacity was increased twice by 60%, and the revamping work was reduced to some extent and the operation stability of system was improved.
    Application study of regeneration of waste lubricating oil with short-path distillating technology
    ZHOU Songrui,YIN Yingsui,WANG Yuanyuan,HUANG Weixing,WANG Xiaoqiang
    2006, 25(11):  1371. 
    Abstract ( 2135 )  
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    The regeneration technologies of waste lubricating oil in recent years were reviewed. The regeneration of waste lubricating oil was tested in a short-path distillation unit with activated white clay as adsorbent. The quality of regenerated oil met the requirements of new oil standards. The technology used in the test had high recovery efficiency and short operation periodand caused no secondary pollution. It was friendly to the environment and had great social and economic benefits.
    Preparation and application of a new polymer-supported titanium catalyst in synthesis of high boiling esters
    DING Yuxing ,LI Aihong ,WANG Jiaxi
    2006, 25(11):  1375. 
    Abstract ( 1660 )  
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    A polymer-supported titanate(PVAC1) was prepared by the reaction of titanium tetrachloride with polyvinyl alcoholand was been characterized with FTIR. The content of titanium of the catalyst was measured by the colorimetric analysis method. The supported titanate was used to catalyze esterification to form high boiling esters. The results showed that the catalytic activity of PVAC-1 was comparable with that of Ti(OBu)4a known highly active catalyst for the synthesis of high boiling esters. Using PVAC-1 as catalystthe conversion of acid was up to 99.8%97.5%and 99.7% for the synthesis of DOPdiheptanol and benzoaterespectively. The catalyst could be recycled without significant loss of activity.
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