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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 September 1996, Volume 4 Issue 2
    Volume 4
    EQUATIONS OF STATE FOR HARD-SPHERE CHAIN FLUIDS AND SQUARE-WELL CHAIN FLUIDS
    LIU Honglai, Rong Zongming, HU Ying
    1996, 4(2):  95-103.  doi:
    Abstract ( )   PDF (1764KB) ( )  
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    Based on the statistical theory for chemical association,equations of state for hard-spherechain fluids(HSCFs)and square-well chain fluids(SWCFs)can be derived through the n-particlecavity correlation function(CCF)of the corresponding reference system,where n is the chain lengthor the number of segments of a chain molecule.The reference system is a fluid composed of only cor-responding monomers.In this work,the n-particle CCF is approximated by a product of effectivetwo-particle CCFs which accounts for correlations in nearest-neighbour and next-to-nearest-neighboursegment pairs.The CCFs for SWCFs may be expressed by a product of the corresponding functionfor HSCFs and a perturbation term originated from the square-well attractive potential.All these ef-fective two-particle CCFs and perturbation terms are density dependent.The dependence is determinedmainly by using computer-simulation results.The obtained equations can excellently describecompressibility factors and second Virial coefficients for HSCFs and SWCFs covering a wide range ofchain length,better than other existing theories.The equations can be used as a basis for developingpractical equations of state for polymer solutions and polymer blends.
    CORRELATION AND PREDICTION OF LIQUID DIFFUSION COEFFICIENTS IN BINARY SYSTEMS
    YANG Xiaoning, WANG Rongshu
    1996, 4(2):  104-111.  doi:
    Abstract ( )   PDF (1820KB) ( )  
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    A theoretical model to correlate and predict the liquid diffusion coefficients in binary sys-tems has been developed.Based on this mode1 the diffusion coefficient of 73 binary systems have beencorrelated,the overall average deviation of the correlation for diffusion coefficients is 0.009.Forbinary systems the diffusion coefficients have been predicted from vapor liquid phase equilibrium(VLE)and vice versa.
    CONCENTRATION PARTITION OF PROTEIN SOLUTION IN A MICROPORE:EFFECT OF ELECTROSTATIC INTERACTION
    HE Zhimin, ZHANG Haiyang, YU Guocong, DiegoBarba, DanielaSpera
    1996, 4(2):  112-119.  doi:
    Abstract ( )   PDF (1835KB) ( )  
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    A theory for calculating the electrostatic interaction between protein molecules and the wallof a liquid-filled micropore is established in terms of solving the Laplace and the linearPoisson-Boltzmann equations.The surface charge of protein molecules is measured by theelectrophoresis velocity,whilethe charge of the pore wall is obtained by the ionic Donnan equilibrium.The theory is then used to study the influence of solute-pore electrostatic interaction on theconcentration partition of protein solution in a micropore under different solution properties.Experi-mental verification is performed by detecting the hindered diffusion of bovine serum albumin in thetrack-etched polycarbonate membranes.A good consistence between the theoretical and experimentaldata is being achieved.
    THE DESIGN OF VANADIUM TRAPPING SYSTEM FOR FCC CATALYSTS
    PAN Huifang, WU Xiaofeng, TANG Aijun, SHEN Zhihong, ZANG Gaoshan
    1996, 4(2):  120-124.  doi:
    Abstract ( )   PDF (1193KB) ( )  
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    The addition of distillation residues to the FCC feedstock leads to increased vanadiumloading on catalyst and the problems in catalyst deactivation.The deactivation process is related tothe destructive attack on the zeolite crystallite by V_2O_5.Formation of low melting pointV_2O_5-USY-Na_2O phases accelerates the diffusion of vanadium through the catalyst.A proposedmechanism,based on accelerated dealumination,is shown in the paper.Comparative vanadiumtrapping performances have been tested for FCC catalysts and the crystalline ABO_3 as an effectivevanadium trap is demonstrated in laboratory tests.
    RHEOLOGICAL BEHAVIOR OF POLYMER MELTS (II) MULTIPLE ENTANGLEMENT MODEL FOR PREDICTING THE DEPENDENCE OF VISCOELASTIC BEHAVIOR ON DEFORMATION STATE AND PRIMARY MOLECULAR WEIGHTS AND THEIR DISTRIBUTION
    SONG Mingshi, WU Sizhu, YANG Jincai
    1996, 4(2):  125-140.  doi:
    Abstract ( )   PDF (3521KB) ( )  
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    In accordance with the memory function of Gaussian chain constraints in entangled polymermelts a set of material functions related to a certain"test flow"are formulated from the O-W-Ftype constitutive equation by the appropriate selection of the Cauchy-Green and Finger tensors.Thedependences of these material functions on the strain rate and the dependences of the linearviscoelastic functions on the primary molecular weight distribution and the entanglement sites sequencedistribution on polymer chain are derived from a multiple-entanglement model and a couple of mech-anisms of relaxation for the loop and terminal entanglement sites.When the primary polymer chainsare modelled with the Lansing-Kraemer molecular distribution function,a set of new relationshipsamong linear viscoelastic functions(η_0,ψ_(10)~0,η_(ext)~0 and τ_1)and the molecular weights and their distributionare formulated.These functions and relationships are verified with experimental data.
    HYDRODYNAMIC MODEL FOR THE IMPELLER REGION IN AN AERATED AND STIRRED TANK
    GAO Zhengming, WANG Yingchen, SHI Litian, FU Jufu
    1996, 4(2):  141-149.  doi:
    Abstract ( )   PDF (1665KB) ( )  
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    The radial and axial distribution of mean 1iquid velocity were measured by a.hot-filmanemometer at the impeller region in an aerated and stirred tank 0.287m in diameter.The tangentialjet model for impeller discharge flow used for single phase flow was modified to conform with thecharacteristics of gas-liquid flow.The radial and axial velocity profiles at the impeller region in thegas-liquid stirred tank were calculated by the model The results predicted by the model were in goodagreement with those obtained in experiment.
    BUBBLE SIZES AND HOLDUP STRUCTURE IN BUBBLE COLUMNS DETERMINED BY DYNAMIC GAS DISENGAGEMENT
    LUO Hean, KaiHjarbo, HallvardSvendsen
    1996, 4(2):  150-161.  doi:
    Abstract ( )   PDF (3180KB) ( )  
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    A new model for determining bubble size distributions in bubble columns by the dynamic gasdisengagement(DGD)technique is developed.It is based on an idea of non-uniform steady statedirstribution of bubble dispersion.Interpreting the axial non-uniformity,this model gives axial gasholdup distributions.If assuming an axially homogeneous dispersion,a radial gas holdup distributioncan be obtained.The Sauter mean diameters or specific interfacial areas for several systems areestimated by the technique.The results for an air-water system agree with those measured by afive-point conductivity probe technique.The obtained axial gas holdup distributions agree well withreported measurements and the radial gas holdup distributions are also reasonable.
    RHEOLOGICAL STUDIES ON REACTION INJECTION MOLDING PROCESS WITH A SLIT MEASURING SYSTEM
    JIANG Tiqian, LI Chunzhou, FANG Bo, LI Jian
    1996, 4(2):  162-167.  doi:
    Abstract ( )   PDF (1063KB) ( )  
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    A non-reacting system and a reacting system are run with an on-line slit rheometer devel-oped by the authors.It is found that the polyurethane-urea system behaves slightly elastic and theZaremba-Fromm-Dewitt model may be employed to describe its rheological behaviors.After the geltime,the inside pressure of the testing materials varies dramatically.Reports in this respect have notbeen found in literature,as yet its mechanism warrants further studies.
    SOLUBILITIES OF CARBON DIOXIDE IN MIXTURES OF n-DECANE-n-HEXADECANE AND n-HEPTANE-TOLUENE
    ZHANG Lianzhong, HAN Shijun, HelmutKnapp
    1996, 4(2):  168-173.  doi:
    Abstract ( )   PDF (1285KB) ( )  
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    Solubilities of CO_2 in binary mixtures of n-decane-n-hexadecane and n-heptane-toluenewere measured in a glass apparatus by a synthetic method.Henry’s constants at several temperaturesand solvent compositions were reported.While the Henry’s constants of CO_2 in mixtures of decaneand hexadecane can be satisfactorily predicted by a simple linear interpolation,prediction of Henry’sconstants for CO_2 in mixtures of heptane and toluene requires excess Gibbs energy of the solvent mix-tures.The standard thermodynamic functions of solution(ΔH~0,ΔG~0,and ΔS~0)were reported.
    A FUZZY MATCH BASED EXPERT SYSTEM FOR SYNTHESIS OF SEPARATION PROCESSES
    AIAN Yu, KristianM.Lien
    1996, 4(2):  174-182.  doi:
    Abstract ( )   PDF (2440KB) ( )  
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    A predictive parallel search algorithm,the fuzzy match inference strategy,is implemented ina prototype expert system.Selection of separation technologies and sequencing of separators are beingapproached in an integrated manner.The fuzzy match mechanism results in a relatively smaller subsetof favored schemes,constituting a hyperstructure for further quantitative evaluation and combinationoptimization.An industrial application example of aromatics extraction separation is presented.
    A FURTHER INVESTIGATION ON THE PARAMETERS OF THE VDW TYPE EQUATION OF STATE
    DONG Junhang, XU Nanping, WANG Yanru, SHI Jun, BenjaminC.-Y.Lu
    1996, 4(2):  183-188.  doi:
    Abstract ( )   PDF (1346KB) ( )  
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