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Table of Content
25 September 2006, Volume 25 Issue 9
    进展与述评
    New development of dehydrogenation of propane to propylene
    YU Changlin,GE Qingjie,XU Hengyong,LI Wenzhao
    2006, 25(9):  977. 
    Abstract ( 1814 )  
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    The development of the dehydrogenation of propane to propylene,including catalytic dehydrogenation,oxidative dehydrogenation and dehydrogenation in the membrane reactor is summarized and analyzed. Although,catalytic dehydrogenation of propane has been commercialized,the performance of catalysts needs to be further improved. The development of low temperature and high selectivity catalysts is the key issue for propane oxidative dehydrogenation. Compared with the traditional dehydrogenation,the membrane reactor has its advantages in propane dehydrogenation. It can overcome the restriction of thermodynamic equilibrium and shift the reaction to the dehydrogenation direction. So,in the membrane reactor,the conversion of propane and the yield of propylene are very high. If the activity and stability of catalysts for propane dehydrogenation and the hydrogen perm-selectivity of the membrane reactor can be further improved,the membrane reactor is a promising method for the dehydrogenation of propane.
    Technological advances in conversion of heavy aromatics to light aromatics
    2006, 25(9):  983. 
    Abstract ( 1737 )  
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    The heavy aromatics are important feedstocks to produce light aromatics. The conversion of heavy aromatics to light aromatics includes many reactions such as hydrodealkylationdisproportionation and transalkylation. The advantages and shortcomings of some representative technologies of the conversion of heavy aromatics to light aromaticssuch as TAC-9ATA-11 and Transplusare analyzed. The key future trends in this field are presented. According to the characteristics of the conversion reactionthe molecular sieves with small particle size and large pore diameter should be chosen as an active ingredient of solid acid catalysts to produce xylene.
    Pollution and utilization of chemical industry waste slag in China
    LOU Ziyang,SONG Liyan,ZHAO Youcai,ZHANG Wenhai
    2006, 25(9):  988. 
    Abstract ( 1625 )  
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    The primary information of waste slag of chemical industry in China, especially the chemical composition and production output, were summarized. The total metal contents in the waste slag of chemical industry in China included Fe(calibrated as Fe2O3)9030~10560 kt/a, Al(calibrated as Al2O3)3380~4280 kt/a, Ba(calibrated as BaSO4)250~380 kt/a, while Mg(calibrated as MgO)1910~2770 kt/a. As to waste catalyst in chemical industry, the contents of precious metals are higher, such as Co 100~720 t/a, Pt group 0.4~0.5t/a, Ag 130~170 t/a, Cr 600~2000 t/a. The potential pollution control,treatment technologies of waste slag and the development trends were also described. It is suggested that based on harmless treatment, the waste slag of chemical industry should be regarded as the secondary resource and be reused according to its own characteristics, among which the recovery of metals from slag is more important, comparing to the other ways, such as using as road construction and substitute materials for cement.
    Current status of thermal energy storage technologies used for concentrating solar power systems
    ZUO Yuanzhi,DING Jing,YANG Xiaoxi
    2006, 25(9):  995. 
    Abstract ( 2093 )  
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    Starting with introducing the development background of concentrating solar power (CSP),this survey describes the recent trend and characteristics of thermal energy storage (TES) technologies used for CSP. The research progress of CSP in China is also briefly analyzed. On this basis,it is pointed out that the economic type TES is a key technological issue for achieving marketization of CSP systems and a two-tank molten salt storage system where the heat transfer fluid (HTF) also serves as the storage medium for heat storage tower should be paid more attention in the future.
    Progress of biological hydrogen production(Ⅰ)
    KE Shuizhou,MA Jingwei
    2006, 25(9):  1001. 
    Abstract ( 1670 )  
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    This paper presents seven types of biological hydrogen production systems and the mechanism,affecting factors,methods of enhancement of hydrogen production as well as research progress. The recent studies are focused on photo fermentation and anaerobic fermentation technology. Anaerobic fermentation systems have the great potential to be developed as practical biological hydrogen systems due to its high hydrogen yield. A hybrid system using photosynthesis and fermentative bacteria can enhance the hydrogen production and reduce the need for light. The process will be the future direction of biological hydrogen production.
    Progress of biological hydrogen production(Ⅱ)
    KE Shuizhou,MA Jingwei
    2006, 25(9):  1006. 
    Abstract ( 1477 )  
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    This paper discusses the characteristics of waste treatment by biological hydrogen production. The merits and demerits of different processes and the possibilities of practical application are also discussed. Anaerobic fermentation is the most potential technology,and can be used in commercial production. Storage of hydrogen is introduced. The demand of fuel cells for biological hydrogen production technology and the feasibility of application to fuel cells are discussed. The prospects of biological hydrogen production processes are presented.
    Development in fuel processors for hydrogen production based on sheet lamination technology
    PAN Minqiang,TANG Yong,LU Longsheng,ZHANG Yihong,LI Yong
    2006, 25(9):  1011. 
    Abstract ( 1632 )  
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    The principle of fuel processors for hydrogen production is presented,and the advantages of fuel processors for hydrogen production based on sheet lamination technology are analyzed in terms of four key techniques,microchannel structures,distribution of flow paths,connections between sheets and sheet materials,providing the basis of design. The prospect of sheet lamination technology used in fuel processors for hydrogen production is discussed.
    Technique analyses and research progress of CO2 separation from flue gas
    by chemical absorption
    YAN Shuiping,FANG Mengxiang,ZHANG Weifeng,LUO Zhongyang,CEN Kefa
    2006, 25(9):  1018. 
    Abstract ( 1784 )  
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    The techniques of carbon dioxide separation from flue gas by chemical absorption are presented. The problems to be solved in carbon dioxide separation are analyzed. The research progress of chemical absorption is discussed. Finally,two research directions of chemical absorption are presented.
    Research progress of removal of H2S on impregnated activated carbon
    XIAO Yonghou,WANG Shudong,YUAN Quan
    2006, 25(9):  1025. 
    Abstract ( 1657 )  
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    The research progress of removal of H2S on impregnated activated carbon is reviewed,and the mechanisms of the reaction are summarized. The factors that affect the reaction,including pore distribution,component of impregnant,surface properties of activated carbon and ash content,are discussed. The effects of relative humidity,the feed composition and temperature on the removal process are also discussed. The regeneration of spent activated carbon is briefly discussed. The prospect of the desulfurization method is presented.
    Adsorption and removal of organic impurities in ultra purity hydrogen peroxide preparation
    LIN Qian,GENG Jianming,JIANG Yanbin,QIAN Yu
    2006, 25(9):  1031. 
    Abstract ( 1598 )  
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    The state-of-the art production techniques of ultra purity hydrogen peroxide are presented. The mechanisms of purification of activated carbon, the generation and removal of organic impurities in industrial grade hydrogen peroxide are presented. It is proposed that the adsorption separation process is simple and of better purification effect, compared with other relevant separation techniques. At the same time, the adsorption technology for removing organic impurities from industrial grade hydrogen peroxide is discussed in detail.
    Progress of combination photocatalytic oxidation in wastewater treatment
    ZHANG Leguan
    2006, 25(9):  1036. 
    Abstract ( 1604 )  
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    Photocatalytic oxidation is regarded as a future advanced oxidation technology in environmental protection. Its combination with other technology has become a focus of wastewater treatment. The research and application of combination of photocatalytic oxidation technology and oxidantelectrochemistryultrasonic wavemicrowavemagnetizationbiological degradation in water and wastewater treatment are summarized.The mechanism of combination photocatalytic oxidation is briefly analyzed. The prospect of future application is presented.
    Recent research on biological safety of nanometer-scale materials
    LIU Hongmei,HUANG Kaixun,XU Huibi
    2006, 25(9):  1040. 
    Abstract ( 1624 )  
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    Recent research on the biological safety of nano-materials is summarized. Moreoverseveral research aspects are introducedincluding the transport of nano-materials in the environmentthe relationship between the size and structure of nano-materials and their biological effectsthe possible mechanisms by which nano-materials interact with biological tissuethe criteria of evaluating the biological safety of nano-materials. The prospect of the study on the biological safety of nano-materials is also discussed.
    Progress of applications of phenylboronic acid and its derivatives in pharmaceutical and chemical engineering
    XU Dan,CHU Liangyin
    2006, 25(9):  1045. 
    Abstract ( 1627 )  
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    Phenylboronic acid and its derivatives are known to form reversible complexes with polyol compounds,including sacccharides,glycolipids,glycoproteins,nucleotides etc,and consequently they have been widely used for recognition,separation and detection of those compounds. The applications of phenylboroinc acid and its derivatives in the fields of self-regulated insulin delivery,tissue engineering,separation and sensor systems are reviewed. Their further developments in pharmaceutical and chemical engineering are presented.
    Research progress on novel support material of polyolefin catalyst
    SONG Jirui,XIA Zengmin,WEN Lixiong,CHEN Jianfeng
    2006, 25(9):  1049. 
    Abstract ( 1683 )  
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    Research progress in recent years of the polyolefin metallocene catalyst support,which includes the preparation of the novel support,the structure characteristics and performance of the supported metallocene catalyst,on the properties polymerization products,was reviewed. The hollow silica agglomerated support was prepared and likely to be used as a novel catalyst support. The support could be not only applied to classical Ziegler-Natta catalyst and metallocene catalyst as catalyst support,but also applied to post-metallocene catalyst,non-metallocene catalyst and so on as catalyst support for olefin polymerization. The novel support can replace imported support in olefin polymerization and make possible self-made silica gel as catalyst support for olefin polymerization.
    Research progress of thermal degradation of polyether
    ZHANG Zhiguo,YIN Hong
    2006, 25(9):  1056. 
    Abstract ( 1569 )  
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    The research progress of the thermal degradation of polyether is reviewed. The thermal degradation products of polyether in the absence or presence of oxygen are presented. The thermal degradation mechanisms of polyether in the absence or presence of oxygen,the factors affecting thermal stability and the thermal degradation kinetics of polyether are discussed.
    Preparation and properties of polyurethane/polyacrylate (PUA) hybrid emulsion
    PAN Hongxia,XIAO Mingyu,CHEN Dajun
    2006, 25(9):  1064. 
    Abstract ( 1670 )  
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    The preparation of polyurethane/polyacrylate(PUA) hybrid emulsion is summarized,including blend,seed emulsion polymerization,in-situ polymerization etc. Several factors affecting the properties of PUA emulsion,such as the structure of polyurethane and polyacrylate,the initiator of polymerization and the process of preparation,are discussed. Then the nano-inorganic and cross-linking modification of PUA hybrid emulsion are presented. Further development in the future is indicated.
    研究开发
    Degradation of micro quantity organic compound in water using synergetic catalysis and ozonation
    CHEN Ying,SONG Cunyi,CHANG Cheinchi
    2006, 25(9):  1069. 
    Abstract ( 1465 )  
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    The water from the final clarifier of municipal waste water treatment was selected as original water containing micro concentration recalcitrant organic contaminants andthe captive test was conducted. The degradation effects of organic contaminants in the water,which was difficult to remove by biochemical process,were investigated with four methods:O3,O3/C,O3/UV and O3/UV/C. The results showed that besides improving the ozonation degradation of micro concentration organic contaminants and the utilization of ozone,ultraviolet light at 254nm wavelength and activated carbon had synergetic action on ozonation. The results of captive test showed that,in the O3/UV/C reactor,the removal rate of ultraviolet absorbency E254 and the removal rate of CODCr could be up to 87.40% and 59.79% respectively. The utilization of ozone could be up to 91.4%. The influence of different radical scavengers on ozonation were investigated. The results showed that the ozonation degradation of organic contaminants in the water from the final clarifier was due to different kinds of radical reactions and hydroxide radical reaction played the most important role.
    Degumming of coix lachrymal-jobi seeds miscella by ceramic ultrafiltration membrane
    DU Shaolong,ZHOU Chunshan,LI Zhengfeng,CHEN Hongjing
    2006, 25(9):  1074. 
    Abstract ( 1585 )  
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    Degumming of coix lachryma-jobi seeds miscella(CLSM)was studied by using ceramic ultrafiltration (UF) membrane. The degumming results of different molecular weight cut-off (MWCO) ceramic ultrafiltration membranes were compared. The effects of trans-membrane pressure, temperature and operation time on membrane flux were studied. Over 90% lecithin in CLSM could be removed, when it is ultra-filtrated by the MWCO of 15000 UF membrane at 50℃ and 0.5MPa. The membrane flux could be completely recovered by means of proper cleaning procedures of using sodium hydroxide and sodium hypochlorite successively to remove the pollutants .
    Preparation of polysilicate ferro-aluminum sulfate and flocculation treatment of thin stillage
    DING Bin,GUAN Chang,CAI Xiaorui,LI Liqun,SUI Xin
    2006, 25(9):  1078. 
    Abstract ( 1628 )  
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    Purification and characterization of a novel carbonyl reductase with high stereo-selectivity
    YANG Ming,XU Yan,MU Xiaoqing,XIAO Rong
    2006, 25(9):  1082. 
    Abstract ( 1716 )  
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    A novel NADPH dependent carbonyl reductase was separated from Candida parapsilosis CCTCC 203011. The enzyme gave a single band on SDS-PAGE,which was purified through ammonium sulfate,DEAE Sepharose FF,Phenyl-Sepharose FF and Blue Sepharose FF chromatography from cell-free extract. The molecular mass of the enzyme was about 30kD. The optimum pH and temperature for reduction were 4.5 and 35℃ respectively. The Cu2+ had strong restrictive effect on enzyme activity. In addition,the carbonyl reductase was an enzyme with high substrate specificity and stereo-selectivity,and showed high asymmetric reduction activity towards α-hydroxyacetophenone and ethyl 4-chloro acetoacetate. For the asymmetric reduction of α-hydroxyacetophenone and ethyl 4-chloro acetoacetate,(S)-1-phenyl-1,2-ethanediol and (R)-ethyl 4-chloro-3-hydroxybutanoate were produced by the purified enzyme,with the 100% and 94.3% e.e value respectively. So the enzyme could be one of the effective biocatalysts for asymmetric synthesis of chiral alcohols. The amino acid sequences of one peptide from the purified enzyme were analyzed by LC-MASS-MASS,and the carbonyl reductase showed some identity to the hypothetical protein CaO19.10414 reported.
    Enhancement of hyaluronic acid production by Streptococcus zooepidemicus H24 through supplement of CTAB
    WEN Qi,LIU Dengru,CHEN Jian,DU Guocheng
    2006, 25(9):  1089. 
    Abstract ( 1635 )  
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    The effect of different types of surfactants on cell growth and hyaluronic acid (HA) production by Streptococcus zooepidemicus H24 was investigated. Among three surfactants, CTAB played a key role in cell growth and HA production. Compared with the control (without CATB), when 20 mg/L CTAB was added to the flask culture, the concentration of HA increased by 20%. Furthermore, the effect of cationic surfactant CTAB on cell growth and HA production was also investigated in a 2.5 L fermentor. The concentration of HA increased from 5.1 g/L to 5.7 g/L by adding CTAB during 8 h and 12 h. Those results indicated that CTAB enhanced HA production, and CTAB addition benefited the capsule removal of Streptococcus zooepidemicus during fermentation.

    Preparation of N, N–dilauryl chitosan

    SUN Xiaoli,XIN Meihua,LI Mingchun,SHU Sheng
    2006, 25(9):  1095. 
    Abstract ( 1488 )  
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    N, N-dilauryl chitosan with a high degree of substitution of alkyl group was prepared by reduction of the Schiff’s base,which was formed by the reaction of chitosan and aldehyde. The experimental results showed that only the product obtained from the reaction by adding sodium dodecyl sulfonate coulkd be separated into two parts of alkylated chitosan. One could not dissolve in chloroform,while the other could dissolve in chloroform. The product soluble in chloroform was found to be fully N, N-dilaurylated chitosan by FTIR,NMR and EA measurement.
    Catalyzed chlorination of acetic acid to continuous synthesize
    monochloroacetic acid
    ZHANG Yue,LIU Jianwu,YAN Shenghu,SHEN Jiefa
    2006, 25(9):  1098. 
    Abstract ( 1758 )  
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    High purity monochloroacetic acid was prepared by catalylic chlorination of acetic acid with chorine by using acetic anhydride as the catalyst, and concentrated H2SO4 as the co-catalyst. The optimal conditions of synthesis were as follows: acetic acid /Cl2/ acetic anhydride / H2SO4 is 1︰1.26︰0.08︰0.008, reaction temperature from 100 to 105℃. The purity of monochloroacetic acid can be up to 99%. This method has the advantages of abundant supply of raw materials, simple process, and easy operation.
    Preferred orientation of PAN-based carbon fibers during
    continuous graphitization
    LI Dongfeng,WANG Haojing,XUE Linbing,WANG Xinkui
    2006, 25(9):  1101. 
    Abstract ( 1526 )  
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    The changes of preferred orientation of PAN-based carbon fibers during continuous high temperature graphitization and hot stretching graphitization were investigated by X-ray diffraction (XRD). The results showed that the degree of preferred orientation within PAN-based carbon fibers increased with the increasing heat treatment temperature (HTT) and the ratio of hot stretching,respectively. Both in high temperature graphitization and in hot stretching graphitization the fiber’s tensile modulus increased with increasing preferred orientation,but the values of preferred orientation (Z) determined by XRD were different for the same value of modulus. The relationship between microstructure and modulus showed that tensile modulus did not only depend on the preferred orientation,but also related to the crystallite size. In addition,even after heat treated to 3 000 ℃,the fiber’s preferred orientation (Z) was only 14.71°,indicating the fiber’s turbostratic layers were still not highly aligned.
    应用技术
    Application of ternary refrigeration to ethylene plant
    WANG Jiping
    2006, 25(9):  1105. 
    Abstract ( 1805 )  
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    The ternary refrigeration technology was developed by ABB Lummus Ltd., based on binary refrigeration technology. It was first used in the ethylene plant of Qilu Petrochemical Company Ltd. in China. It ia analyzed that most of process parameters could not reach the design values after first commissioning After taking correction action, the system became normal, and main process parameters reached design values. The situation of commissioning, problems during operation and the measures adopted are introduced. Recommendation for handling operation problems is also made .
    Separation of ethylene glycol/water mixture with A-type zeolite membrane
    HUANG Yanke,XU Wenqing,YANG Weishen,ZHU Linghui,TAN Zhenming
    2006, 25(9):  1110. 
    Abstract ( 1506 )  
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    A-type zeolite membrane was synthesized by the vacuum seeding and secondary growth method. The pervaporation and vapor permeation processes for the separation of ethylene glycol/water mixture,and the effect of separation temperature and EG concentration on the flux were studied. The separation stability of the A-type zeolite membrane reached more than 1 000 h. The separation selectivity and stability were kept at a high value,and the separation factor and flux at 120℃ were 10 000 and 10 kg•m-2•h-1 respectively.
    Adjustor of vapor phase concentration of durene
    DING Zhiping,ZHU Zhiqing
    2006, 25(9):  1114. 
    Abstract ( 1579 )  
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    The influence of the temperature of durene solution, the height from airway nozzle to liquid level, the temperature and feed rate of air on the vapor phase concentration of durene were studied with the self-made adjustor. As a result, the temperature of the durene solution and the feed rate of air had a greater influence on the vapor phase concentration of durene, whilethe influence of the height from airway nozzle to liquid level and the feed air temperature on the vapor phase concentration was small. The vapor phase concentration of durene could be adjusted by the self-made adjustor.
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