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Table of Content
05 February 2013, Volume 32 Issue 02
    Recent progress in selective catalytic conversion of cellulose into key platform molecules
    DENG Li1,LIAO Bing1,GUO Qingxiang2
    2013, 32(02):  245-254. 
    Abstract ( 1960 )  
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    Cellulose is the most abundant plant biomass component,which is also an important candidate for replacing fossil resource with the aim of sustainable future. In the present article,authors reviewed the catalytic transformation of cellulose into platform compounds,including glucose,hydroxymethylfurfural,levulinic acid and polyols via ionic liquids,solid acids and noble metal catalysts. Moreover,the application and the further transformation of these compounds were also introduced,for instance,the oxidation and reduction of hydroxymethylfurfural,the conversion of levulinic acid into γ-valerolactone,hydrocarbon,1,4-butandiol and methyl tetrahydrofuran,and the catalytic reforming of polyols into liquid fuels. The advances on the transformation of cellulose into platform compounds will shed a new light on the sustainable future in terms of the renewable resource.
    Research progress of the characteristics of instantaneous flow in static mixer with twisted-leaves
    YU Yanfang1,WANG Feng1,MENG Huibo1,WANG Yanfen2,WANG Wei1,WU Jianhua1
    2013, 32(02):  255-262. 
    Abstract ( 1838 )  
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    This paper first summarized the features of static mixing technology. The recent progress of researches on statistical characteristics of pressure fluctuation signals (PFS) and velocity field,multi-fractal,and chaotic mixing,were mainly described. The experiment results showed that the relationship between the maximums of pressure fluctuations and the inlet flow rates can be described by a quadric equation and the power amplitude follows power-law attenuation as the frequency increased. The chaotic advection were generated and field synergy between velocity and temperature gradient can be effectively improved by the coupled secondary flow derived from the free vortex in the internal wall and the forced vortex in the bulk zones. In the end,the intensification impacts of flow division,flow reversal and radial mixing of the twisted-leaves in the static mixer on formation of CO2 hydrate were summarized as well. Finally,the mixing mechanism of the multiphase fluid in the static mixer could be further interpreted based on the integration of CFD,mapping approach and LIF,PIV,PFS tools.
    Advances in hollow fiber pervaporation composite membrane and module
    WANG Naixin,ZHANG Guojun,JI Shulan
    2013, 32(02):  263-269. 
    Abstract ( 1867 )  
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    Hollow fiber membrane module has great potential for industrial applications because of the advantages of its small size and low cost. In this paper,advances in hollow fiber pervaporation composite membrane and module were reviewed. The effects of membrane material,preparation method and structural parameters for pervaporation performances were analyzed. The studies of pilot-scale hollow fiber pervaporation membrane modules were summarized. From pilot-scale study,it was observed that the packing density,fiber length and suction way of the hollow fiber pervaporation membrane module may affect the vacuum in the downstream side. The molecular design of membrane material,optimization of module structure and solvent and high temperature resistance of sealing are critical conditions during the industrial application process in the future.
    Morphology of particle produced by spray-freeze drying
    XU Qing,GENG Xianru,LI Zhanyong
    2013, 32(02):  270-275. 
    Abstract ( 1989 )  
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    Spray Freeze Drying (SFD) is a novel engineering technology for production of size-controlled,porous,instant-solubility,good-flowability powders. SFD has advantages in the production of specific particles especially in pharmaceutical,food,and chemical industries,the recent developments in SFD have been reviewed in this paper. Particle formation and morphology characteristics resulting from the steps of SFD process were discussed. The effects of freezing on the products of protein,liposome,vaccine particles,inorganic materials were also included in the discussion. SFD disadvantages,such as discontinuity,time-consuming and inconvenient handing of cryogenic liquids,were mentioned. Finally,optimization of the SFD process and drying intensification were pointed out as the future research directions.
    Influence of the flow in orifice pan liquid distributor on the uniformity of outflow through orifices
    YU Hongfeng1,LI Xingang1,2,LI Hong1,2
    2013, 32(02):  276-282. 
    Abstract ( 2821 )  
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    A computational fluid dynamics (CFD) simulation,consisting of a homogeneous multiphase model,VOF method and SST turbulence model,was performed to investigate the influence of the flow in orifice pan liquid distributor on the uniformity of outflow through orifices. Firstly,a deviation from the standard value (flow rate of outflow through single orifice) was proposed to evaluate the uniformity of outflow through orifices. The influence of the flow in distributor on the outflow through orifices was quantified by the value of the deviation. Subsequently,based on the simulated results and the concept of the flow region in front of the orifices,it was found that the non-uniformity of the outflow through orifices was caused by the non-uniformity of the flow in distributor. Finally,the structure of the orifice pan liquid distributor was optimized by changing feed pipe positions. The simulated results showed that the liquid distribution performance was improved because the large-scale maldistribution was avoided when the feed positions were changed.
    Experimental and numerical simulation study on bubble behavior in passive DMFC
    ZHANG Feixiang,QI Liang,YAO Kejian
    2013, 32(02):  283-289. 
    Abstract ( 2116 )  
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    The performance of passive direct methanol fuel cell can be greatly influenced by the removal of the carbon dioxide produced from catalyst layer diffusion layer and the anode channel. The study of gas-liquid two-phase flow behavior taking place in the anode channel is necessary for the optimization of the passive direct methanol fuel cell. A volume of fluid model was used to simulate the formation of bubbles in the rest methanol solution under various conditions. Experiments of visualization were conducted to validate the results. The results showed that portrait of bubble was elongated with buoyancy and surface tension,bubble tail was cut under the sheer force of liquid. The inclination angle may get bubble detachment more easily. Bubbles were able to merge with gas rate increasing. Bubbles detachment could form a chain in high methyl concentration solution. The results help to design and optimize the diffusion layer.
    Numerical simulation of flow characteristics in a 65t/h high-low bed CFB
    LIU Hongpeng1,2,XIAO Jianbo2,LI Weiyi3,CHEN Guanyi1,WANG Qing2
    2013, 32(02):  290-294. 
    Abstract ( 2010 )  
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    Gas-solid flow behavior of a 65 t/h high-low bed CFB has been simulated using Eulerian-Eulerian model (EEM) with kinetic theory of granular flow by Fluent,a commercial CFD software. RNG k-ε per phase turbulence model,Gidaspow drag model and Schiller-naumann drag model were adopted to evaluate the governing equations. The comparative study with regard to single size particle model and different particle model based on EEM was performed. The diameter of particles in single size particle model was unique,while three kinds of diameter in different particle models were set to achieve the size distribution. Gas-solid flow characteristics were obtained for solid velocity,pressure,solid volume fraction. The calculated pressure was compared with the measured data. The results showed that the Eulerian-Eulerian two-phase model can predict preferably the gas-solid flow behavior. The conclusion of numerical study provided theory basis for the optimization design,operation and large-scale of high-low bed CFB.
    Dryness of gas-liquid two-phase flow forecast based on the PSO-LS-SVM predictive model
    ZHOU Yunlong,ZHANG Quanhou,DENG Yanqiu
    2013, 32(02):  295-298. 
    Abstract ( 2104 )  
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    To improve the standard orifice plate design a better outflow characteristics of tapered orifice. Using tapered orifice differential pressure fluctuation characteristics of the empirical formula and Least Square Support Vector Machine (mixed kernel) which is improved by particle swarm optimization establish the soft sensing model of two-phase flow dryness. The mixed kernel of this model is constituted of radial basis function and polynomial kernel,it can be both the local fitting ability and global fitting ability of Least Square Support Vector Machine. What’s more,by optimizing parameters of the Least Square Support Vector Machine,this model can reduce the dependence on the initial point and the number of samples. The experimental results show that such a prediction method is feasible than not optimized least squares support vector machine model and the optimized mononuclear least squares vector machine model generalization ability. So,it can be widely used in engineering practice.
    Continuous process for the hydrolysis of benzal chloride to benzaldehyde in a micro-channel reactor
    YAN Shenghu1,CHEN Daixiang1,SHEN Wei2,SHEN Jiefa1,MA Bing2,LIU Jianwu1,ZHANG Yue1
    2013, 32(02):  299-302. 
    Abstract ( 3064 )  
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    With the catalysis of hydrochloric acid,benzaldehyde was continuously synthesized from benzal chloride in a micro-channel reactor. The effects of temperature,catalyst starting concentration,reactant mole ratio,and residence time on the hydrolysis reaction were investigated. At optimized reaction condition i.e.,20% catalyst starting concentration,140 ℃,n(hydrochloric acid)∶n(benzal chloride)=15∶1 and residence time of 370 s,the conversion of hydrolysis of benzal chloride reaches 69.2%,with a benzaldehyde selectivity (GC) beyond 99.9%. Compared to traditional industrial techniques,this makes the process continuously and time effectively. With hydrochloric acid as the catalyst,it avoided the pollution to final product caused by traditional metal catalyst residues.
    Experiments and kinetic analysis on the co-pyrolysis of cellulose and lignin
    JIN Pen,LI Baoxia
    2013, 32(02):  303-307. 
    Abstract ( 3066 )  
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    The characteristics and kinetics of pyrolysis and co-pyrolysis of the cellulose and lignin were investigated using a thermogravimetric analyzer (TGA). The TG/DTG curves show that the pyrolysis process of lignin alone has two different temperature zones; the rapid pyrolysis of cellulose happens in the temperature zone of 300—380 ℃; mutual inhibition occurs in co-pyrolysis at the low content of cellulose (≤40%),and synergistic effect appears at the high content of cellulose(≥60%). The results of kinetics analysis testify that the process of pyrolysis and co-pyrolysis of cellulose and lignin can be described with a first order reaction model. The activation energy(E) increases with the content of cellulose increasing further,but its value is always lower than the activation energy of linear additivity(Ec),which partly illustrates that synergistic effect happens in the process of co-pyrolysis.
    Energy planning based on distributed power generation system in industrial parks
    LUO Yanling,YAN Liexiang,LU Hai,LIN Zixiong
    2013, 32(02):  308-312. 
    Abstract ( 3065 )  
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    The distributed energy system and combined heat and power has great advantages in economics,energy efficiency and carbon emission reduction. Aiming at the solutions of low energy comprehensive utilization and serious greenhouse gas emissions in existing industrial parks ,this paper built an integrated energy planning model of industrial parks based on distributed energy system. According to the park’s requirements of heat ,power,vapor and cold load in each time period,locally available resources and alternative energy conversion technologies,the model minimized overall system cost to determine types and sizes of energy conversion devices,the amount of energy supply and carbon-dioxide emission. And the proposed model has been used to solve energy planning problems of industrial park and proved to be effective.
    Investigation and simulation on electrolyte distribution for all-vanadium redox flow battery
    XU Bo1,QI Liang1,YAO Kejian1,XIE Xiaofeng2
    2013, 32(02):  313-319. 
    Abstract ( 2924 )  
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    Based on computational fluid dynamics(CFD), a traditional straight parallel flow channel was equipped with a sloping baffle and a flow weir to improve the uniformity of electrolyte distribution and to investigate the fluid flow behavior for all-vanadium reodx flow battery. The hydrodynamics characteristics of vanadium electrolyte in sectional form multi-channel of serpentine flow channel was discussed. The numerical simulation results showed that the sectional form multi-channel of serpentine flow channel can not only keep the good uniformity of electrolyte distribution,but also be able to reduce flowing resistance and pump consumption. In addition,it can optimize the distribution of electrolyte concentration and improve the battery efficiency by choosing the appropriate flow rate of electrolyte and more uniformity of electrolyte distribution.
    Catalyst for hydrogenation of dinitrotoluene to diaminotoluene
    YAN Shaowei1,2,FAN Hui2,YU Zhihui1,LIANG Chuan1,LI Zhong1,MENG Fanjing3
    2013, 32(02):  320-326. 
    Abstract ( 2716 )  
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    Research progress of catalysts for hydrogenation of dinitrotoluene to diaminotoluene was reviewed. Research achievements of (Pd+Pt)/C,Raney-Ni,supported Ni-based,Ni based amorphous alloy and Urushibara Ni based catalysts were introduced. By comparing the advantages and disadvantages of catalysts above-mentioned in production cost,preparation process and performance for dinitrotoluene hydrogenation,Ni amorphous alloy catalysts exhibited the advantage of low price,high hydrogenation performance,and similar catalytic activity and selectivity with (Pd+Pt)/C industrial catalyst at 1 MPa,so it was the first alternative catalyst for industrial noble metal and Raney-Ni catalyst. Urushihara nickel catalyst had the advantages of simple preparation process,low price and similar hydrogenation performance with Raney-Ni catalyst,with the potential for commercialization.
    Research progress of catalysts for copolymerization of CO2 and epoxides
    QIN Gang1,3,FAN Lidan2,CAO Shaokui3,BU Zhanwei3,CHEN Tao1,YI Kui1
    2013, 32(02):  327-332. 
    Abstract ( 2657 )  
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    Chemical fixation of CO2 is a very attractive subject not only from carbon resource utilization,but also from increasing environmental concerns. In this paper,the significance and methods of CO2 participation in chemical reactions are introduced. Carbon dioxide-based polycarbonates is compared with bisphenol-A polycarbonates,and the emphasis is highly efficient catalyst in copolymerization of CO2 and epoxides to produce aliphatic polycarbonates. Recent progress of the catalysts for copolymerization of CO2 and epoxides is reviewed,and their advantages and disadvantages are discussed. The difficulties in future research are pointed out. The copolymerization product has wide application prospect due to its biodegradability and carbon oxide as raw material.
    Advance in straight run gasoline isomerization catalysts
    CHENG Wei,CHENG Xiaojing,WANG Xuefeng
    2013, 32(02):  333-339. 
    Abstract ( 1755 )  
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    Advance in straight-run gasoline isomerization catalysts and the use in China are introduced in this paper. At present,straight-run gasoline isomerization catalysts are focused on metal catalysts loaded on porous carrier,especially bifunctional catalysts loaded on molecular sieves. The most suitable catalyst carrier,the balance between loaded metal and carrier acid center,and the use of common metals instead of noble metals are the hot topics of research. The application of straight-run gasoline isomerization catalysts in refineries shows a diversified situation. A variety of different catalysts with their own characteristics are used by different refineries.
    Research progress of adsorption/activation and catalytic hydrogenation of CO2
    LI Jing1,DENG Tingyun2,YANG Lin1,CAO Jianxin1
    2013, 32(02):  340-345. 
    Abstract ( 3225 )  
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    Growing emission of CO2 has brought serious consequences to the environment. At the same time,fossil energy is depleting,which challenges oil-based low carbon olefins industry. Using CO2 to produce carbon olefins is one of effective ways to alleviate the dual pressure of environment and resource. Thermodynamic analysis of CO2 hydrogenation to light olefins,adsorption/activation mechanism of CO2 on single crystal and oxides of transition metal and research progress of catalyst for hydrogenation of carbon dioxide to light alkenes are reviewed. The advantages and disadvantages of catalysts for CO2 hydrogenation,including single metal catalysts,bimetallic catalysts and the composite catalyst are analyzed. The problem of catalyst is how to balance selectivity and conversion rate. The future research directions of catalyst are mechanism of catalytic reaction,and catalyst preparation and modification.
    Research progress of plasmonic Ag/AgX(X=Cl,Br,I) photocatalysts
    WANG Huan,CUI Wenquan,HAN Bingxu,LIANG Yinghua
    2013, 32(02):  346-351. 
    Abstract ( 2734 )  
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    Ag/AgX photocatalysts,as the new photocatalysts,exhibited high photocatalytic activity for the degradation of organic pollutants under visible light irradiation due to the obvious surface plasmon resonance (SPR) effect in the visible light region. In this paper,the structure,mechanism,preparation methods and morphology of plasmonic Ag/AgX(X=Cl,Br,I) photocatalysts are reviewed. The applications of plasmonic Ag/AgX photocatalysts for the degradation of industrial dye wastewater are summarized and the trend of the plasmonic Ag/AgX(X=Cl,Br,I) photocatalysts for the degradation of high concentration and multi-component waste water is also discussed.
    Research of Cu-ZnO catalysts for sec-butanol dehydrogenation to methyl ethyl ketone
    JIANG Guangshen1,HU Yunfeng1,2,CAI Jun1,XU Peng3,CONG Liang1,FANG Fei1
    2013, 32(02):  352-358. 
    Abstract ( 1899 )  
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    Copper-zinc catalysts prepared by co-precipitation and physical mixing were characterized by TPR,XRD and N2O adsorption-decomposition techniques to analyze the roles of ZnO and Cu in the dehydrogenation of sec-butanol (SBA). The studies suggested that Cu0 were active sites and ZnO was provided with the properties of dispersion and anti-sintering of Cu species. ZnO could effectively disperse Cu species and prevent Cu0 from sintering because (CuZn)x(OH)y(CO3)z(x=1,5;y=2,6;z=1,2) precursor was formed in catalyst preparation and highly dispersed CuO-ZnO solid solution was shaped after calcination. Optimum Cu/Zn molar ratio was also studied for the dehydrogenation tests of SBA. Cu/Zn molar ratio at 1∶1 exhibited excellent reactivity. Conversion of SBA and yield of methyl ethyl ketone (MEK) reached 80.54% and 76.04%,respectively,under atmospheric pressure,at reaction temperature 240 ℃ and weight space velocity 17.5 h?1. The dehydrogenation activity of copper-zinc catalyst was not in linear relationship with Cu0 surface area,indicating that dehydrogenation of SBA could be a structure-sensitive reaction.
    Preparation of carbon-based solid acid catalyst for synthesis of methyl propyl carbonate
    NI Bangqing,JIA Guoliang,FAN Mingming,WANG Hui
    2013, 32(02):  359-363. 
    Abstract ( 2168 )  
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    A carbon-based solid acid catalyst was prepared by using glucose as raw material.The impact of preparation parameters on catalyst activity was investigated by using transesterification between dimethyl carbonate (DMC) and propyl alcohol as model reaction.The results showed that optimal catalytic activity was attained over the catalyst carbonized at 300℃ for 2 h,sulphonated at 130 ℃ for 10 h and mass ratio of sulfuric acid to carbon material 100.Under optimal transesterification conditions∶mole ratio of propyl alcohol to DMC 2,reaction temperature 90 ℃,reaction time 5h and mass ratio of catalyst to total raw materials 4%.Conversion of DMC and selectivity to methyl propyl carbonate (MPC) were about 40% and 90%,respectivdy.There was very little change in the catalytic activity of the regenerated catalyst after four cycles.
    Performance of Pd-Ag/Al2O3 catalyst for hydrogenation of butadiene
    YUE Yi,YANG Dong,ZHU Yunxian,DAI Wei
    2013, 32(02):  364-367. 
    Abstract ( 2211 )  
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    Selective hydrogenation of butadiene in C4 mixture to produce 1-butene on Pd-Ag/Al2O3 catalyst was studied. The test results showed that selectivity of 1-butene produced from 1,3-butadiene hydrogenation was closely related to both inlet 1,3-butadiene concentration and H2/butadiene mole ratio. Under the conditions of inlet temperature 40 ℃,pressure 1.0 MPa,liquid space velocity 40h?1,when inlet butadiene concentration was more than 2.6%,selectivity of 1-butene maintained at more than 66%;when inlet butadiene concentration was less than 2.6%,selectivity of 1-butene began to decline as isomerization reaction was intensified. When inlet butadiene concentration was less than 1.0%,outlet 1,3-butadiene concentration could be reduced to less than 1.0×10-5. With the increase of H2/butadiene mole ratio,1-butene selectivity declined linearly when inlet butadiene concentration was between 0.50% and 0.85%,indicating that excess H2 with respect to butadiene was an important reason for isomerization and hydrogenation reactions of butene. H2-TPR and XPS results showed that Pd-Ag alloy was formed during catalyst reduction.
    Preparation of Fe-MCM-41 mesoporous molecular sieves from coal-series kaolin and selective catalytic reduction of NOx
    WU Qisheng1,LI Shuiping1,LU Guosen2,ZHANG Changsen1
    2013, 32(02):  368-372. 
    Abstract ( 2588 )  
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    Hexagonal Fe-MCM-41 mesoporous molecular sieves with different contents of iron were synthesized by the hydrothermal method from coal-series kaolin,cetyl trimethyl ammonium bromide and iron nitrate as raw materials. Fe-MCM-41 was characterized by Fourier Transform Infrared Spectroscopy (FTIR),N2 adsorption and desorption isotherm plot methods and High Resolution Transmission Electron Microscopy (HRTEM). NO catalytic activity of selective catalytic reduction (SCR) with the prepared molecular sieves and ammonia as reductant under different conditions,such as dosage of Fe,temperature,space velocity,n(NH3)/n(NO) and O2 concentration were studied. The result indicated that Fe was introduced into the framework of MCM-41 mesoporous materials. BET specific surface area was in the range of 980.2~596.8 m2/g,pore volume was in the range of 0.95~0.60 cm3/g,and average pore diameter calculated by BJH method was in the range of 3.90~3.45 nm. Fe-MCM-41 with n(Fe)/n(Si)=0.05 had the highest catalytic activity at 350℃,and the highest NO conversion was 90.7% at a space velocity of 5000 h?1,n(NH3)/n(NO)=1.1 and O2%=2.5%.
    Progress of cathode materials for electrochemical reduction of carbon dioxide
    ZHAO Chenchen,HE Xiangming,WANG Li,GUO Jianwei
    2013, 32(02):  373-380. 
    Abstract ( 3009 )  
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    Electrochemical reduction of carbon dioxide is of great importance not only for the environment but also for the resource and economic benefit. Development of cathode materials for electrochemical reduction of carbon dioxide and researches on these electrode materials in aqueous,organic and ion-liquid media are reviewed in this paper,and their advantages and disadvantages are discussed. In aqueous media,adequate H+ is provided for the CO2 hydrogenation reaction with a comparatively easy process,but the product shows less obvious promise for fuel use. In organic solution,high efficiency is achieved while reaction mechanism follows complicated pathways. Ion-liquid is a new research field with a much lower overpotential for CO2? formation,nevertheless the products are much more complex and difficult to separate. A prospect for further developments in this field is presented,requiring deeper research on composite material and reaction interface.
    Research progress of synthesis and self-assembly for poly(ethylene glycol)-containing block copolymers
    LI Zhiguang1,MA Xiaoyan1,CHANG Hai2,CHEN Zhiqun2
    2013, 32(02):  381-387. 
    Abstract ( 2072 )  
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    Research progress of radical polymerization methods for block copolymers with poly(ethylene glycol) is reviewed in this paper,including ATRP (atom transfer radical polymerization),NMP (nitroxide-mediated radical polymerization),and RAFT (reversible addition-fragmentation chain transfer polymerization). Meanwhile,self-assembly in solution and applications of PEG-containing block copolymers in drug carriers,mesoporous materials and carbon nanotubes are also summarized. PEG-containing block copolymers can self-assemble into a variety of morphology of structures,which will directly affect the performance and application of the materials,so these structures have potential value and application prospects. The synthesis of new PEG-containing block copolymers and development of new,morphology-controlled self-assembly structures and new applications will be a central issue in the future with important scientific significance and practical value.
    Preparation and adsorption behavior of chlorogenic acid imprinted polymer by using nano-TiO2 as sacrificial support material
    TAN Xianzhou 1,LI Hui 1,2,LU Cuimei 2,LI Gui 1
    2013, 32(02):  388-393. 
    Abstract ( 1939 )  
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    Preparation of chlorogenic acid (CGA) imprinted polymer based on the surface imprinting technique was carried out by using nano-TiO2 as sacrificial support with CGA as template,MAA, EGDMA and AIBN as functional monomer,cross-linker and initiator,respectively. Structural characterization was performed by FTIR and SEM analysis. Static adsorption of the template on the polymers was investigated. The results indicated strong adsorption capability and higher adsorption selectivity (relative selectivity coefficient of 3.353) for the hollow molecularly imprinted polymer (H-MIP) toward the template molecule. Freundlich model was shown better than Langmuir model to describe isotherm adsorption behavior of H-MIP toward the template. This H-MIP also revealed good adsorption capability when it was utilized in solid phase micro-enrichment of chlorogenic acid from the methanol extract of Eucommia ulmoides.
    Absorption of CO2 in aqueous mixtures of functionalized ionic liquids and MDEA
    WANG Zhanli,XU Fan,XING Xiaolin,REN Baozeng
    2013, 32(02):  394-399. 
    Abstract ( 2777 )  
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    Two functionalized ionic liquids (ILs) – tetraethylammonium alaninate ([N2222][Ala]) and tetraethylammonium serinate ([N2222][Ser]) were synthesized by using the one-step method and verified with IR and 1H NMR, and their glass transition temperature and thermal decomposition temperature were determined. The solubility of CO2 in aqueous blends of N-methyl-diethanolamine (MDEA) and these two ILs were carried out at 40 ℃ and the results showed that both of these two ILs had a positive effect on the absorption of CO2, increasing by 8.63% and 5.40%, respectively, when IL’s concentration was 10%. Moreover, physical properties namely, density and viscosity of these mixed solutions were measured over a temperature range of 20 ℃ to 60 ℃ to provide basic data for further application of ILs.
    Preparation of emulsion explosives with cerium nitrate by detonation method
    XIE Yichao,HAN Zhiwei,XIE Lifeng
    2013, 32(02):  400-403. 
    Abstract ( 1703 )  
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    In order to study the application of emulsion explosives in synthesizing nanosized ceria,emulsion explosives,in which Ce(NO3)3?6H2O and NH4NO3 acted as the main oxidant,were prepared by detonation method. The detonation velocity of emulsion explosives with different content of Ce(NO3)3?6H2O was measured. Their exothermal character was tested by Differential Scanning Calorimeter(DSC). Results indicated that the detonation velocity of emulsion explosives was significantly affected by the content of Ce(NO3)3?6H2O and the content was suggested to be no more than 50% for emulsion explosives in detonation synthesis. The heat output and the exothermic rate of emulsion base depended on the content of Ce(NO3)3?6H2O in emulsion explosives,which should be kept within 30%—50% in detonation synthesis. The content of Ce(NO3)3?6H2O in emulsion explosives was 40%,the nano ceria size was about 70nm,and crystal form was cubic.
    Preparation of polyamine microsphere and its protein adsorption properties
    LIU Pei1,2,NIE Tingting1,2,WANG Feng1,2
    2013, 32(02):  404-409. 
    Abstract ( 1917 )  
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    A novel polyamine microsphere was prepared using inverse emulsion as the templet. In the W/O emulsion of aqueous solution of polyethylenimine(PEI)/ liquid paraffin,glutaraldehyde (GA),the crosslinking agent,was added in a dropwise feeding mode. After the droplets coalescence,the crosslinking reaction happened at the interface of the emulsion droplets,and the polyamine microspheres were obtained. The microsphere is entirely spherical and shows a smooth outer surface. The size distribution of the microspheres ranges 0.37~4.29 ?m. The average particle size of the obtained miscrosheres is 1.44 ?m. The isoelectric point of the microsphere is 10.6. The analysis of TGA and DTG on the microspheres indicates that crosslinking significantly improves the decomposition temperature of PEI. The investigation results of protein adsorption demonstrates that the microspheres can selectively adsorb lipase from a mixture of lipase,cellulase,?-amylase,and pectinase. The maximum adsorption capacity of the microsphere for the lipase tested is 127.8 mg/g.
    Investigation on the preparation and characterization of palygorskite/sodium alginate composite microspheres for the sustained releasing of Cu2+
    XU Tingting,LI Zhifang,WU Jie,CHEN Jing
    2013, 32(02):  410-413. 
    Abstract ( 1694 )  
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    Sodium alginate microspheres are traditional sustained releasing materials;gel strength enhancement and capillary porosity increment are effective ways to improve their sustained releasing ability. Atomic adsorption spectrometry along with micro appearance characterization and swelling experiments are used to explore the feasibility of sustained releasing of Cu2+ of sodium alginate/palygorskite microspheres. Palygorskite improves the gel strength of the microspheres as well as their sustained releasing ability. Comparing with the sodium alginate microspheres,the composite ones prepared with proposed method had better adsorption ability (from 91.82% to 94.60%). In addition,the cumulative releasing percentage within 2 hours decreased from 66.35% to 22.78%. Thus,palygorskite/sodium alginate composite microspheres can be an ideal carrier for long term sustained releasing drugs.
    Progress in enzyme electrode of biofuel cell
    HOU Xiuzhang1,MA Xiaoyan1,XI Yuchen1,CHANG Hai2
    2013, 32(02):  414-419. 
    Abstract ( 1973 )  
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    The recent research progress in enzymatic electrodes,including enzymatic species,mediator and direct electron transfer electrode and enzyme immobilization,are illustrated. For the purpose of improving conversion efficiency of biological fuel cell,the influences of various factors are analyzed. Different redox enzymes should be used to enhance electron transfer,by using small molecules or redox polymer mediators current density can be increased,the improvement of direct electron transfer can be achieved by modification with some conductive polymer materials,as well as the physical or chemical enzyme immobilization methods can dramatically influence the stability of enzymes. Therefore,searching for the new technologies and new materials to build enzymatic electrode with high enzyme activity and electron transfer efficiency will be the direction of future development in this field.
    Isolation of a NMMO-tolerant cellulase-producing strain and optimization of corresponding fermentation conditions
    XIA Dongqin1,HE Yucai1,TAN Chunwei2,GONG Lei1,GONG Ting1,YAN Shenghu1,ZHANG Yue1,WANG Liqun1
    2013, 32(02):  420-424. 
    Abstract ( 2269 )  
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    Based on the conventional screening methods,a NMMO-tolerant cellulase-producing strain Galactomyces sp. CCZU11-1 with high cellulase activity has been isolated from soil samples using enrichment culture media containing 10 g/L NMMO. The optimal culture condition has been found,under which strain CCZU11-1 was cultured for 7 days,and the activity of FPA and CMCase was 13.5 IU/mL and 24.6 IU/mL respectively,while the carbon source was the bagasse (5 g/L),the nitrogen source was (NH4)2SO4 (5 g/L),the initial culture pH was 5.5,the culture temperature was 30 ℃ and the additive was surfactant Tween-80 (8 g/L). To add 200 g/L NMMO in the culture and reaction system respectively,the cellulase from this strain Galactomyces sp. CCZU11-1 still had good activity, indicating that it had high NMMO-tolerant ability and potential application.
    Research progress in the production and synthesis of furfural
    ZHANG Luxin,YU Hongbing
    2013, 32(02):  425-432. 
    Abstract ( 3241 )  
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    Furfural is a highly versatile and key derivative used in the manufacture of a wide range of important chemicals. However,it is also associated with low yield,energy-intensive and negative environment impact in conventional process for producing furfural. Current mainstream techniques (Quaker Oats,Agrifuran,Petrole-chimie,Escher Wyss and Rosenlew) for furfural production are reviewed;the mechanism and kinetics of hydrolysis of hemicelluloses into furfural are analyzed. The equipment up to date and alteration for furfural production are also discussed. Besides,new furfural manufacturing-processes are analyzed by optimizing solvent,catalyst,separation and heat-up. In order to minimize the impact of furfural production to environment,the research on new green catalyst and solvent system should be more emphasized.
    Research progress in dialkyldi(or mono)thiophosphoric(or phosphinic) acid compounds
    WANG Yongquan,LIU Guangyi,REN Heng,DI Ning
    2013, 32(02):  433-440. 
    Abstract ( 1892 )  
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    Dialkyldi(or mono)thiophosphoric(or phosphinic) acid compounds containing sulfur and phosphorus,or sulfur,phosphorus and oxygen atoms,could easily form chelates with metal ions and have been widely used as metal extractants,corrosion inhibitors,flotation collectors,lubricating oil additives,or agricultural pesticides and herbicides. This paper reviews the interaction of dialkyldi(or mono)thiophosphoric(or phosphinic) acids with metal ions,the applications of dithiophosphate compounds such as dicresyl and dialkyl dithiophosphates in the mineral flotation,and the utilization of di(or mono)thiophosphinic acids in the extraction recovery of zinc,cadmium,copper,iron and precious metals and in the separation of cobalt from nickel,or actinides from lanthanides. Based on the review results,further investigations of dialkyldi(or mono)thiophosphoric(or phosphinic) acids were conducted,which included their new synthetic methods and extraction performances.
    Free radical scavenging ability of a novel intramolecular complex antioxidant
    LI Cuiqin1,WANG Jun1,WEI Yujia1,MENG Xiangyong2
    2013, 32(02):  441-445. 
    Abstract ( 1843 )  
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    Radical scavenging ability of a novel intramolecular complex antioxidant towards 1,1-diphenyl-2-picrylhydrazyl (DPPH?) free radical was studied by uv-vis spectrophotometer,and compared with that of antioxidant BHT and antioxidant 1076. Results showed that the radical scavenging ability of the novel intramolecular complex antioxidant was superior to that of commercial antioxidants BHT and 1076. The scavenging ability increased with the increase of the concentration of the antioxidant,and the scavenging ability increased first and then kept constant afterwards. Temperature has little influence on the reaction rate,which showed that activation energy was lower and this reaction can proceed rapidly at room temperature. The antioxidation performance for polyethylene was evaluated by melt flow rate and oxidation induction time. Results also showed that the antioxidant ability of the synthesized complex antioxidant was superior to the commercial antioxidant BHT and 1076.
    Research progress of multipurpose utilization technologies of brine from seawater desalination plant
    LIU Luofeng1,2,ZHANG Yushan2,HUANG Xiping2,ZHANG Jiakai2,ZHANG Hongwei1
    2013, 32(02):  446-452. 
    Abstract ( 2852 )  
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    Multipurpose utilization of brine from seawater could not only realize zero-discharge from seawater desalination plant,but also effectively utilize the valuable chemical resources. The current main multipurpose utilization technologies were summarized in the paper. The technologies combined with the salt production method by solar evaporation,based on the concentration by electrodialysis,and the comprehensive utilization technique to finally prepare liquid salt,were emphasized;the respective advantages and existing problems were also discussed; the application conditions and prospects were described from the perspectives of time and space. It was pointed out that the integration of electrodialysis and nanofiltration can be a fairly good way of realizing factory production of salt and other chemicals in the future;furthermore,development of new techniques with high resource utilization ratio,high additional value of products,less land occupation,utilization of renewable energy,comprehensive extractions of trace elements such as lithium,uranium,boron,iodine,cesium,were proposed as the research directions and development trends of multipurpose utilization technologies of brine in China.
    Research on the influences of ozonation-activated carbon technology on membrane fouling mitigation in membrane bioreactor
    ZHANG Haifeng,LIU Hongpeng,ZHANG Lanhe,ZHAO Guilong,ZHENG Cheng,GAO Wei, CHAI Huijian
    2013, 32(02):  453-459. 
    Abstract ( 2219 )  
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    This study was aiming at investigating the effects of ozonation-activated carbon technology on membrane fouling mitigation in membrane bioreactor (MBR). The results from the short-term experiment showed that power activated carbon (PAC) would improve the efficiency of ozone. When the ozone dosage was more than 0.25 mg/(gSS),the filterability of mixed liquor would deteriorate. Analysis of residual ozone in the effluent indicated that PAC would benefit to maintain the constant ozone concentration in the bulk solution. The introduction of ozonation-activated carbon technology into the MBR system would be beneficial to the system because membrane fouling could be controlled in long-term experiment. The microbial activity was somewhat inhibited,however,the effluent quality of the system was affected at a minimal level. Ozonation-activated carbon could reduce the protein and carbohydrate fractions in the soluble microbial products (SMP). The amount of loosely bound extracellular polymeric substances (LB) and the protein fractions in extracellular polymeric substances (EPS) were also decreased obviously by ozonation-activated carbon technology. These findings indicated the feasibility of using ozonation-activated carbon technology to control MBR membrane fouling.
    Catalytic gasification kinetics of biomass semi-char
    XIAO Ruirui1,YANG Wei1,YU Guangsuo2
    2013, 32(02):  460-465. 
    Abstract ( 2424 )  
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    The reaction kinetics of straw catalytic gasification was investigated in a thermogravimetric analyzer. Also the catalytic gasification of char from co-gasification of petroleum coke and biomass was studied. A modified random pore model was used to correlate the relationship between gasification rate and carbon conversion rate. The apparent activation energy and pre-exponential factors of biomass with different catalysts were obtained. The results indicated that the gasification activity of biomass semi-char with catalysts was enhanced apparently. The catalytic activity order of different chars was found to be K-char>Ca-char> Mg-char>raw-char>acid washing-char. The increase of the gasification rate of petroleum coke blended with biomass indicated that the gasification reaction is enhanced by biomass char. The apparent activation energy order of different chars in gasification is K-char
    Extraction of cellulose from furfural residue
    YUAN Yanli,ZHU Chunshan,ZHANG Xiaoyuan
    2013, 32(02):  466-469. 
    Abstract ( 2484 )  
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    Cellulose was extracted from furfural residue by the Milox three-stage method with formic acid and hydrogen peroxide as agents,which was combined with cooking and bleaching of alkaline hydrogen peroxide,and the totally chlorine-free bleaching process was accomplished in the separation of cellulose and lignin from furfural residue. The effects of formic acid dosage,hydrogen peroxide dosage,reaction temperature and time on the extraction efficiency were discussed. The results showed that when the appropriate dosage of formic acid and hydrogen peroxide were 80ml and 14ml respectively,the first-stage reaction at the temperature of 80 ℃ for 2.5 hours,the second-stage reaction at 95 ℃ for 2.5 hours and the third-stage reaction at also 80 ℃ for 2.5 hours after filtering and adding the new equal agents to the filtrate,the cellulose yield was 41.92%,the content of extracted cellulose was 85.09% and the lignin content was 3.22%. The results excels the others and the practical value of furfural residue may be more improved.
    Dissolution and regeneration of cellulose from zoysia japonica in AMIMCl by alkali activation
    WANG Yannan,JU Meiting,LI Weizun,LI Qian
    2013, 32(02):  470-474. 
    Abstract ( 2304 )  
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    Dissolution and regeneration of cellulose from zoysia japonica in 1-ally-3-methylimidazolium chloride (AMIMCl) by the activation of NaOH with different concentrations was studied. Component analysis of lignocellulose content in activated zoysia japonica suggested that activation could improve cellulose content and the structure and crystalline were destroyed to certain degree,i.e.,alkali activation could improve the reactivity of AMIMCl and zoysia japonica. It reached optimal when NAOH concentration was 10%. The chemical structure of the original and regenerated zoysia japonica was analyzed by NMR,XRD and FT-IR,which suggested that AMIMCl had a good solubility for cellulose in activated zoysia japonica. As an environmentally friendly solvent,AMIMCl could be easily recycled and reused.
    Design and development of refinery scheduling optimization system
    YU Bing1,2,GAO Xiaoyong1,2,BAI Liang1,2,SHI Lei1,2,JIANG Yongheng1,2,HUANG Dexian1,2
    2013, 32(02):  475-480. 
    Abstract ( 1796 )  
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    Production scheduling optimization for refinery to improve economic benefit and enhance enterprise competitiveness has an important role. An overall design and system development of a graphical refinery scheduling optimization software wereare discussed in this paper. The model-view-controller (MVC) technology is was used and we realizeto obtain the graphical scheduling optimization model,and convenient configuration of scheduling model can be obtained. A famous open source software package (Coin-OR) which is a famous open source software package,is was transplanted for optimization solver of our software,and the interface between the solver with Coin-OR and the graphical model was is realizedobtained. The software was able to provides extensive reports,making,which makes field operators easy to obtain the scheduling results easily. The software was also able to provide Pperfect internal model data management and extensive interfaces are provided by software,including crude oil properties database,crude oil evaluation database interface,product oil properties database etc. and so on. The simulation results showeds that this software can provide practical optimal schedule scheme for the refinery industry.
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