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SCI和EI收录∣中国化工学会会刊
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Table of Content
28 August 2003, Volume 11 Issue 4
    RESEARCH PAPERS
    Hydrodynamics and Solids Mixing Behavior in a Riser with Blunt Internals
    LIU Hui'e, WEI Fei, YANG Yanhui, JIN Yong
    2003, 11(4):  371-376.  doi:
    Abstract ( )   PDF (1966KB) ( )  
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    The hydrodynamics and solids mixing behavior in a riser with blunt internals are studied. A
    uniformradial distribution for solids fraction and particle velocity achieves near the
    internals. The turbulent velocityof particles near the wall increases with the addition of
    the internals, with the lateral solids mixing enhancedsignificantly. Probability density
    distribution of particle velocity is bimodal in the riser with internals, which issimilar
    to that in the conventional riser, indicating that no significant difference in the micro
    flow structure existsbetween the riser with internals and the conventional riser. At the
    same time, the axial solids mixing behaviorchanges insignificantly with the addition of
    internals. These results indicate that the micro flow structure in theriser is very stable,
    which changes insignificantly with the change of the bed structure.
    Interaction between large-scale vortex structure and dispersed particles in a three
    dimensional mixing layer
    LUO Kun, ZHENG Youqu, FAN Jianren, CEN Kefa
    2003, 11(4):  377-382.  doi:
    Abstract ( )   PDF (1984KB) ( )  
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    In order to understand the interaction between large-scale vortex structure and particles,
    a two-waycoupling temporal mixing layer laden with particles at a Stokes number of 5 with
    different mass loading plantedinitially in the upper half region is numerically studied.
    The pseudospectral method is used for the flow fluid andthe Lagrangian approach is employed
    to trace particles. The momentum coupling effect introduced by a particle isapproximated to
    a point force. The simulation results show that the coherent structures are still dominant
    in themixing layer, but the large-scale vortex structure and particle dispersion are
    modulated. The length of large-scalevortex structure is shortened and the pairing is
    delayed. At the same time, the particles are distributed more evenlyin the whole flow field
    as the mass loading is increased, but the particle dispersion along the transverse
    directiondiffers from that along the spanwise direction, which indicates that the effect by
    the addition of particle on thespanwise large-scale vortex structure is different from the
    streamwise counterpart.
    Mathematical Model of Gas Permeation Through PTFE Porous Membrane and the Effect of
    Membrane Pore Structure
    ZHANG Xiuli, ZHANG Weidong, HAO Xinmin, ZHANG Huifeng, ZHANG Zeting, ZHANG Jianchun
    2003, 11(4):  383-387.  doi:
    Abstract ( )   PDF (1556KB) ( )  
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    Membrane-based separation processes are new technology combined membrane separation with
    conven-tional separation. Hydrophobic porous membranes are often used in these processes.
    The structure of hydrophobicporous membrane has significant effect on mass transfer
    process. The permeabilities of five kinds of gas, He, N2,O2, CO2 and water vapor, across
    six polytetrafiuoroethylene(PTFE) flat membranes were tested experimentally.Results
    indicated that the greater the membrane mean pore size and the wider the pore size
    distribution are, thehigher the gas permeability. A gas permeation model, including the
    effects of membrane structure parameter and gasproperties, was established. A comprehensive
    characteristic parameter (including porosity, thickness and tortuosity)was found more
    effective to express the influence of membrane structure in gas permeation process. The
    predictedpermeation coefficients were in good agreement with experimental data.
    Kinetics of the Reaction Between Ozone and Cationic Red X-GRL
    ZHAO Weirong, SHI Huixiang, WANG Dahui
    2003, 11(4):  388-394.  doi:
    Abstract ( )   PDF (2039KB) ( )  
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    The ozonation of Cationic Red X-GRL in a semi-batch reactor was studied with variation of
    the gas flowrate, initial Cationic Red X-GRL concentration, temperature, and pH value. By
    the evaluation of the liquid masstransfer coefficient, the interfacial area, and the
    stoichiometric ratio between ozone and Cationic Red X-GRL, therate constants and the
    kinetic regime of the reaction between ozone and Cationic Red X-GRL were investigated
    byapplying the experimental data to a model based on the film mass transfer theory. The
    results obtained support asecond order overall reaction, first order with respect to both
    ozone and dye, and the rate constants were correlatedby a modified Arrhenius Equation of
    temperature and pH value with activation energy of 18.06kJ@mol-1. Hattanumber of the
    reaction was found to be between 0.026 and 0.041, it indicates that the reaction occurs in
    the liquidbulk, corresponding to the slow kinetic regime.
    Extended XG Equation for the Prediction of Adsorption Equilibrium of Vapor Mixture on
    Activated Carbon
    XIE Zili, GUO Kunmin, WU Jufang, YUAN Cunqiao
    2003, 11(4):  395-398.  doi:
    Abstract ( )   PDF (1266KB) ( )  
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    The XG equation, which is developed by us previously for describing the adsorption
    equilibrium of purevapor on activated carbon, is extended to multi-component system.
    Verified by experimental data, the extendedXG equation was found to be more successful in
    predicting the adsorption equilibrium of vapor mixture on activatedcarbon than the extended
    Langmuir equation, the extended BET equation and the ideal adsorbed solution theory(IAST).
    Semi-batch Crystallization of 7-Amino-Desacetoxycephalosporanic Acid
    WANG Jingkang, LIU Yue
    2003, 11(4):  399-402.  doi:
    Abstract ( )   PDF (1396KB) ( )  
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    Semi-batch crystallization of 7-amino-desacetoxycephalosporanic acid (7-ADCA) is a
    complicated pro-cess, in which agglomeration occurs together with nucleation and crystal
    growth. To systematically study such aprocess, experiments were conducted to estimate the
    crystallization thermodynamics and kinetics, and then theprocess was simulated by a
    numerical method. The application of Monte Carlo concept in the algorithm to
    describeagglomeration event offers an alternative approach of solving the population
    balance, the intrinsic simplicity of whichallows us to investigate several mechanisms and
    include several internal coordinates in the analysis. Furthermore,present study may be a
    valuable paradigm for other semi-batch crystallization processes.
    Micronization of Griseofulvin by Ress in Supercritical CO2 with Cosolvent Acetone
    HU Guoqin, CHEN Hongyan, CAI Jianguo, DENG Xiu
    2003, 11(4):  403-407.  doi:
    Abstract ( )   PDF (1579KB) ( )  
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    Griseofulvin (GF) is an antifungal drug whose pharmaceutical activity can be improved by
    reducingparticle size. In this study the rapid expansion of supercritical solution (RESS)
    was employed to micronize GF.Carbon dioxide with cosolvent acetone was chosen as a
    supercritical mixed solvent. The solubility of GF in super-critical CO2 with cosolvent
    acetone was measured using a dynamic apparatus at pressures between 12 and 32
    MPa,temperatures at 313, 323 and 333K and cosolvent concentration at 1.5, 3.0, 4.5 and 6.0%
    (by mole). The effect ofpre-expansion pressure, extraction temperature, spraying distance,
    nozzle size and concentration of cosolvent on theprecipitated particles was investigated.
    The results show that the mean particle size of griseofulvin precipitated byRESS was less
    than 1.2 μm. An increase in pre-expansion pressure, extraction temperature, spraying
    distance andconcentration of cosolvent resulted in a decrease in particle size under the
    operating condition studied. With thedecrease of nozzle diameter the particle size reduces.
    The crystallinity and melting point of the original material andthe processed particle by
    RESS were tested by X-ray diffraction (XRD) and differential scanning calorimetry (DSC).No
    evident modification in the crystal habit was found under the experimental conditions
    tested. The morphologyof particles precipitated was analyzed by scanning electron
    microscopy (SEM).
    Absorption Rate of CO2 into MDEA Aqueous Solution Blended with Piperazine and
    Diethanolamine
    ZHANG Xu, YANG Yanhua, ZHANG Chengfang, WANG Jun
    2003, 11(4):  408-413.  doi:
    Abstract ( )   PDF (1677KB) ( )  
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    Absorption rate of CO2 into aqueous solution of N-methyldiethanolamine (MDEA) blended with
    di-ethanolamine (DEA) and piperazine (PZ) was studied and a kinetic model was established.
    It is shown thathomogeneous activation mechanism could explain this absorption process. The
    absorption rate coefficients of car-bon dioxide into MDEA aqueous solution blended with
    DEA, PZ or DEA+PZ were compared with each other. Theresults demonstrated that the different
    activation effect of DEA, PZ and DEA+PZ on the carbon dioxide absorptioncomes from the
    difference in CO2 combination rate, transport of PZ and DEA to MDEA and the regeneration
    rateof PZ and DEA.
    A Simple Structure Model for Enzyme Production by Phanerochaete chrysosporium
    ZHENG Zhongming, FOO YinDin, Jeffery Philip Obbard, LIN Jianping, CEN Peilin
    2003, 11(4):  414-419.  doi:
    Abstract ( )   PDF (1844KB) ( )  
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    In order to understand the behavior of ligninolytic enzyme production by white rot fungi
    Phanerochaetechrysosporium, study on time courses and a mathematical model for the
    production of lignin peroxidase (LiP) andmanganese peroxidase (MnP) of the fungi was
    undertaken. Based on the Monod-Jacob operon model, the ligninolyticenzyme would be
    synthesized in the absence of a related repressor. The repressor is assumed to be active in
    thepresence of ammonia nitrogen, and as combined as co-repressor, it causes the inhibition
    of enzyme synthesis. Themodel can explain the mechanism of extracellular ligninolytic
    enzyme production by white rot fungi. The results,as predicted by the model, correspond
    closely to those observed in experimental studies. In addition, some lightis also shed on
    unmeasured variables, such as the concentrations of repressor and mRNA that are related to
    theenzyme synthesis.
    Micromixing in the Submerged Circulative Impinging Stream Reactor
    WU Yuan, XIAO Yang, ZHOU Yuxin
    2003, 11(4):  420-425.  doi:
    Abstract ( )   PDF (1822KB) ( )  
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    Micromixing in the submerged circulative impinging stream reactor (SCISR) developed by the
    authorsis investigated with the Bourne’s reaction scheme. The values measured for the
    impinging velocity, u0, underthe conditions of SCISR normal operation, only is of the order
    of 0.1 m.s-1, are much slower than that inferred,suggesting low power requirement for
    operation. The values of the characteristic time constant for micromixing,tM, determined in
    the impinging velocity range of 0.184m@s-1 < u0 < 0.326m@s-1 are ranged from 192ms to87
    ms, showing that impinging streams promotes micromixing very efficiently. The data follow
    approximately therelationship of tM ∝ u0-1.5. A comparative study shows that the
    micromixing performance of SCISR is much betterthan that of the traditional stirred tank
    reactor. The tM values predicted with the existing theoretical model aresystematically
    longer than those measured by about 2-3 times, implying that the regularity of impinging
    streamspromoting micromixing is unclear yet.
    Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural
    Condensed Tannin
    ZHAN Xinmin, ZHAO Xuan, AKANE Miyazaki, YOSHIO Nakano
    2003, 11(4):  426-430.  doi:
    Abstract ( )   PDF (1621KB) ( )  
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    Lead has caused serious environmental pollution due to its toxicity, accumulation in food
    chains andpersistence in nature. In this paper, removal of lead from aqueous solutions is
    investigated using a novel geladsorbent synthesized from natural condensed tannin. The
    novel adsorbent performs in aqueous solutions as a weakbase with valid basic groups of 1.2
    mmol.g-1 tannin gel particles and therefore results in the elevation of pH valueof aqueous
    solutions. Even when initial pH is 3.6, final pH at equilibrium can climb up to 6.5 that is
    above the pHvalue for Pb(OH)2 precipitation formation and then lead can be removed from
    wastewater by this so-called surfaceprecipitation. The adsorption isotherm can be expressed
    by the Langmuir equation and the maximum capacity foradsorption of Pb is up to 92mg.g-1
    (based on dry adsorbent) when initial pH value is 3.6. Hence, the adsorbentdoes offer
    favorable properties in lead removal with respect to its high adsorption capacity at low
    initial pH value,which is advantageous to lead removal from acidic wastewater. A model is
    put forward to describe the individualadsorption phenomenon of the tannin gel adsorbent.
    Influence of Suspended Emulsion Polymerization Conditions on Particle Characteristics of
    Polyvinyl Chloride Resin
    BAO Yongzhong, WEI Zhenli, WENG Zhixue, HUANG Zhiming
    2003, 11(4):  431-435.  doi:
    Abstract ( )   PDF (1651KB) ( )  
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    Suspended emulsion polymerization of vinyl chloride was carried out in a 5 L autoclave. The
    influenceof agitation, polymerization conversion, dispersant and surfactant on the average
    particle size (PS) and particle sizedistribution (PSD), particle morphology and porosity of
    polyvinyl chloride (PVC) resin was investigated. It showedthat the agitator had great
    influence on the smooth operation of polymerization, PS and PSD. The PS increasedand PSD
    became narrow as polymerization conversion became high. The porosity decreased with the
    increase ofconversion. A convenient choice of additives, both dispersants and non-ionic
    surfactants, allows one to adjust PSand PSD. The PS decreased with the addition of
    polyvinyl alcohol or hydroxypropyl methylcellulose dispersants,and increased with the
    addition of Span surfactants. The addition of dispersants or surfactants also affected
    themorphology and porosity of resin, and PVC resin with looser agglomeration and
    homogeneous distribution of primaryparticles was prepared.
    Reactor Network Synthesis Based on Instantaneous Objective Function Characteristic Curves
    ZHANG Zhishan, ZHAO Wen, WANG Yanli, ZHOU Chuanguang, YUAN Xigang
    2003, 11(4):  436-440.  doi:
    Abstract ( )   PDF (1683KB) ( )  
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    It is believed that whether the instantaneous objective function curves of plug-flow-
    reactor (PFR) andcontinuous-stirred-tank-reactor (CSTR) overlap or not, they have a
    consistent changing trend for complex reactions(steady state, isothermal and constant
    volume). As a result of the relation of the objective functions (selectivity oryield) to
    the instantaneous objective functions (instantaneous selectivity or instantaneous reaction
    rate), the optimalreactor network configuration can be determined according to the changing
    trend of the instantaneous objectivefunction curves. Further, a recent partition strategy
    for the reactor network synthesis based on the instantaneousobjective function
    characteristic curves is proposed by extending the attainable region partition strategy
    from theconcentration space to the instantaneous objective function-unreacted fraction of
    key reactant space. In this paper,the instantaneous objective function is closed to be the
    instantaneous selectivity and several samples are examinedto illustrate the proposed
    method. The comparison with the previous work indicates it is a very convenient
    andpractical systematic tool of the reactor network synthesis and seems also promising for
    overcoming the dimensionlimit of the attainable region partition strategy in the
    concentration space.
    A New Method to Solve Film Model for CO2 Absorption with Aqueous Solution of N-
    Methyldiethanolamine
    ZHONG Zhantie, LI Wei, SHI Yao, HE Feng, ZHOU Minghua
    2003, 11(4):  441-445.  doi:
    Abstract ( )   PDF (1261KB) ( )  
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    The shooting method and the difference method are used for numerical simulation of CO2
    absorptionwith aqueous solution of methyldiethanolamine (MDEA). It is demonstrated that
    these methods are available forthe steady-state model, which may be expressed as a set of
    differential algebraic equations (DAEs) with two-pointboundary values. This method makes it
    possible not only to obtain the concentration profiles for MDEA system, butalso to reveal
    the effect of CO2 interfacial concentration on the enhancement factor. With this numerical
    simulation,the mass transfer process with multicomponent diffusion and reactions can be
    better understood.
    The Behavior of Amphiphile at Oil-Water Interface by Monte Carlo Simulation
    PAN Haihua, LI Xiaofeng, LI Haoran, LIU Dixia, HAN Shijun
    2003, 11(4):  446-451.  doi:
    Abstract ( )   PDF (2773KB) ( )  
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    A novel simple two-dimensional square-lattice model of amphiphile at oil-water interface is
    developed,in which oil and water act as solvent and occupy empty sites and amphiphile
    occupies chains of sites. In thismodel, the oil-water interface is fixed, And amphiphile
    molecules will be enriched at the oil-water interface. Theinterfacial concentration of
    amphiphile calculated by Monte Carlo method shows that it is easier for the hydrophilic-
    hydrophobic balanced amphiphile to stay at the interface. And the adsorption of amphiphile
    increases with theincrease of amphiphile concentration and the decrease with temperature.
    CHEMICAL ENGINEERING DATA
    Measurement and Correlation of Solubility for Propylene in 2-Butanol+Water Solutions
    LIU Guozhu, WU Yulong, REN Yongli, MI Zhentao
    2003, 11(4):  452-455.  doi:
    Abstract ( )   PDF (1142KB) ( )  
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    In order to obtain solubility data of propylene in 2-butanol+water solutions, gas-liquid
    equilibrium(GLE) experiment was carried out at 303.15-333.15 K, 0.3-1.2 MPa with static
    equilibrium still. Original massratios of 2-butanol to water are 1: 0, 9: 1, 8: 2 and 7: 3,
    respectively. The equilibrium data are correlated with anempirical correlation. The average
    relative deviation (ARD) between experimental and calculated values is 2.15%,and the
    maximum relative deviation (MRD) is less than 5%.
    RESEARCH NOTES
    Study on Removal of Bilirubin with Magnetic Affinity Separation Technique
    XU Hui, ZHANG Guoliang, ZHANG Fengbao, WANG Shulan
    2003, 11(4):  456-459.  doi:
    Abstract ( )   PDF (1522KB) ( )  
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    An affinity adsorbent, Cibacron Blue 3GA immobilized magnetic polyvinyl alcohol (PVA)
    microsphereswas used for bilirubin removal taking the advantage of easy separation of
    magnetic sorbent from the biosystem.Fe3 O4 superparamagnetic particles was synthesized with
    hydrothermal reaction of ferrous chloride (FeCl2) and ferricchloride (FeCl3). Such magnetic
    particles are then encapsulated in biocompatible PVA to form magnetic polymermicrospheres
    sized from 2 to 15 nm with hydroxyl groups on its surface. Cibacron Blue 3GA, a dye-ligand,
    wascovalently coupled with the polyvinyl alcohol through the nucleophilic reaction between
    the chloride of its triazinering and the hydroxyl groups of PVA molecules under alkaline
    condition. The affinity adsorbent carried 21.1 μmolCibacron Blue 3GA per gram magnetic
    polymer microspheres was used to remove unconjugated and conjugatedbilirubin from the
    solution which was composed of bilirubin or bilirubin and protein. After the adsorption,
    theadsorbent loaded with bilirubin was removed easily in the magnetic field.
    Single-step Purification of Molecular Chaperone GroEL by Expanded Bed Chromatography
    TONG Xiaodong, YANG Zheng, DONG Xiaoyan, SUN Yan
    2003, 11(4):  460-463.  doi:
    Abstract ( )   PDF (1428KB) ( )  
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    Expanded bed adsorption (EBA) is an integrative downstream processing technique for the
    purificationof biological substances directly from unclarified feedstock. In this study,
    molecular chaperone GroEL, an importantprotein folding helper both in vivo and in vitro,
    was purified by the single-step EBA technique from the unclarifiedhomogenate of recombinant
    E. coli cells. Compared with packed bed adsorption, the EBA technique provideda single-step
    approach to yield an electrophoretic purity of GroEL. After the homogenate loading and
    columnwashing in the expanded bed mode, the GroEL protein was recovered by stepwise salt-
    gradient elution in packed-bed or expanded-bed modes, respectively. The expanded-bed
    elution mode was found as efficient as the packed-bedmode in the purification of GroEL from
    cell disruptate.
    Investigation on Adsorption of Lithospermum erythrorhizon onto Fungal Cell Wall
    Polysaccharides
    MENG Qin, XUE Lian
    2003, 11(4):  464-466.  doi:
    Abstract ( )   PDF (1206KB) ( )  
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    A culture of Lithospermum erythrorhizon adsorbed on fungal cell wall polysaccharides, a
    novel bio-adsorbent made from fnngal cell wall, has been established in this paper. Three
    steps were involved in this immo-bilization. The first step was preparation of suspended
    plant cells from tightly aggregated plant cell clumps. Thedisassembled ratio of 0.715g.g-1
    (the disassembled cells over total cells) was obtained under optimum conditionfor the
    enzymatic reaction. Then, the adsorption of plant cells onto fungal cell wall
    polysaccharides was conductedand the saturated capacity of 12 g cell per gram of carrier
    was obtained in adsorption immobilization. Finally, theculture of cells adsorbed on fungal
    cell wall polysaccharides was compared with that of cells entrapped in alginateor
    suspension cell culture. While exposed to in situ liquid paraffin extraction coupled with
    cell culture, the shikoninproductivity of immobilized cells by adsorption was 10.67 g.L-1,
    which was 1.8 times of that in suspension cultureand 1.5 times of that entrapped in
    alginate.
    CFD Simulation of Hydrodynamic Characteristics in Stirred Reactors Equipped with Standard
    Rushton or 45°-Upward PBT Impeller
    WEI Zuojun, XU shimin, YUAN Yingjin, XU Songlin
    2003, 11(4):  467-471.  doi:
    Abstract ( )   PDF (1716KB) ( )  
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    The hydrodynamic characteristics generated by the standard Rushton or 45°-upward pitched-
    blade-turbine (PBT) impellers in a baffled reactor are numerically simulated for different
    off-bottom clearances (C = 1/3Hand 1/2H) and agitator speeds (100, 150, 200, 250 and
    300r.min-1) by using FLUENT code (Version 5.4). Theresults are compared with the
    experimental and simulated data in the published papers and good agreement isobserved. The
    shapes of the profile of mean velocities seem independent to the speed of agitators under
    theexperimental conditions (100-300 r.min-1).
    Monte Carlo Simulation of First-Order Diffusion-Limited Reaction within Three-Dimensional
    Porous Pellets
    GUO Xiangyun, F.J.Keil
    2003, 11(4):  472-476.  doi:
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    The Monte Carlo method was employed to simulate diffusion and reaction processes within
    three-dimensional porous catalyst pellets. The porous pellets used were represented by a
    Menger sponge and a uniform-pore structure respectively. Results obtained from the fractal
    pellet showed an intermediate low-slope asymptote inthe logarithmic plot of reaction rate
    and reaction probability. However, the low-slope one did not appear when thereaction
    occurred within the uniform pellet. Moreover, it was certified that the fractal structure
    not only generateda new asymptote, but also reduced diffusion resistance of reactants and
    products.
    Study on the Axial Dispersion of Liquid in Column Flotation
    ZHOU Kun, ZENG AiWu, GAO Changbao, YU Guocong
    2003, 11(4):  477-479.  doi:
    Abstract ( )   PDF (1002KB) ( )  
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    An experimental study on the axial dispersion of liquid was carried out in a 0.382-m-ID
    flotation columnpacked with different structured packings or free of packings. The
    correlations of axial Peclet numbers with theliquid and gas superficial Reynolds numbers
    were developed for various packings. Among the packings tested, itis found that in the
    column packed with 250Y or 350Y packings the axial dispersion is the lowest. The additionof
    frother can decrease the axial dispersion. By the simulation analysis of the one-dimension
    dispersion model ofpacked flotation column, it is found that small axial dispersion, high
    collection rate constant and low axial liquidvelocity can increase the collection zone
    recovery.
    Purification of Octacosanol by Agitated Short-Path Distillation
    XU Songlin, WANG Junwu, XU Shimin, WANG Shuhua
    2003, 11(4):  480-482.  doi:
    Abstract ( )   PDF (768KB) ( )  
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    Octacosanol is purified by agitated short-path distillation (SPD). Effects of evaporation
    temperature,number of SPD steps in series and other distillation method on the octacosanol
    recovery and decomposition arestudied. Although the experimental results indicate some
    decomposition when the mixture of higher primaryaliphatic alcohols is distillated by SPD,
    SPD is still an effective method to purify octacosanol. It is concluded thatevaporation
    temperature affects greatly on the purity and recovery of octacosanol.
    Synthesis and Characterization of Poly(St-co-BA) Latex with an Organic-Inorganic Hybrid
    Compound as Emulsifier
    YUAN Junjie, ZHOU Shuxue, LIAO Jianhe, WU Limin
    2003, 11(4):  483-488.  doi:
    Abstract ( )   PDF (1801KB) ( )  
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    A poly (St-co-BA) latex was successfully synthesized by using an organic-inorganic hybrid
    compound(OIHC), an aliphatic carboxylate sodium/nano-silica composite, as the emulsifier,
    and investigated by particlesize analyzer, transmission electron microscope (TEM), optical
    contact angle measurement (OCA) and dynamicmechanical analyzer (DMA). It was found that the
    protective agent, sodium polyacrylate (PA),could obviouslyimprove the polymerization
    stability and the functional monomer, glycidyl methacrylate (GMA), could enhancethe store
    stability of the latex. The particle size of poly(St-co-BA) latex decreased and then
    leveled off as OIHCcontent increased. TEM shows that the prepared polymers were actually
    organic-inorganic nanocomposites, andthese films have better waterproof property than those
    prepared by traditional poly(St-co-BA) latex or organicsilicone modified poly(St-co-BA)
    latex. The nanocomposite polymer has much higher glass transition temperaturethan organic
    silicone modified poly(St-co-BA) polymer containing the same organic silicone content.