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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 1998, Volume 6 Issue 3
    Volume 6
    The Operating Performance of Stirred Column Reactor
    Sun Jianzhong, Wang Dechong, Pan Zuren
    1998, 6(3):  189-197.  doi:
    Abstract ( )   PDF (2024KB) ( )  
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    A theoretical analysis of the effects of flow and mixing on the operating features of a
    stirred column reactor(SCR) with multistage mixers and cooling partition plates was
    conducted. A method for calculating the concentration reduction for a second order chemical
    reaction in a SCR was proposed. The reactants concerned were pre-mixed before feeding into
    the SCR. The SCR was composed of a number of stages with interstage backmixing.
    Experimental investigation with various reaction media were carried out in order to study
    the effect of mixing on the operational performance of the SCR. The experimental data were
    compared with the theoretical results.
    A GE/Equation of State Mixing Rule for Vapor-Liquid Equilibria
    Qu Yixin, Wang Wenchuan, Lee, Y.Y., Chung, K.Y., Lee, Y.W.
    1998, 6(3):  198-212.  doi:
    Abstract ( )   PDF (3315KB) ( )  
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    A new excess Gibbs free energy/equation of state type mixing 0rule was derived by removing the infinite pressure boundary
    condition imposed by Wong and Sandler. The mixing rule was extensively tested in terms of a comprehensive data base,
    consisting of 52 simple nonpolar-nonpolar, carbon dioxide containing, hydrocarbon-hydrocarbon, CFC, polar-polar, nonpolar-
    polar binary and multicomponent systems. Focused on the complete predictive capability, a comparison between the Wong-Sandler
    and the mixing rule proposed was conducted. The results indicate that the new mixing rule is in general superior to the Wong
    -Sandler’s, and the binary interaction parameter as required by the latter is removed, which reduces computing effort and is
    reliable in predictions of vapor-liquid equilibria from low pressures to high pressures.
    The Performance of EOS Models in the Prediction of Vapor-Liquid Equilibria in Asymmetric Natural Gas Mixtures
    Wang Lisheng, H. Gardeler, J. Gmehling
    1998, 6(3):  213-221.  doi:
    Abstract ( )   PDF (2173KB) ( )  
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    The aim of this work is to apply cubic equations of state (EOS) to vapor-liquid equilibria calculations of gas-
    heavy hydrocarbon systems, which are asymmetric in molecular size and are usually found in natural gases. Investigation has
    been done to test the validity of the original PSRK and the cubic simplified perturbed hard-chain (CSPHC) models for global
    phase diagrams. The calculation results show that both equations overpredict vapor pressure in the near critical region. In
    the prediction of the solubilities of high molecular weight (MW) hydrocarbons in the natural gas, the PSRK model gives good
    agreement for the dew point pressure-vapor composition diagrams. Adjustment of the pure component parameters of the CSPHC EOS
    for heavy components to fit the vapor-liquid equilibrium (VLE) data has been proved to give significant promoting in
    prediction accuracy. However, further improvement of a van der Waals EOS, such as SRK, PT and DG models for the asymmetric
    systems by adjusting the three pure component properties, Tc, pc and ω, did not achieve satisfactory results for heavy
    components.
    Modeling of the Relationship Between Pore Size Distribution and Thickness of Ceramic MF Membrane
    Dong Junhang, Wang Pei, Xu Nanping, Shi Jun, Jerry Y.S.Lin
    1998, 6(3):  222-232.  doi:
    Abstract ( )   PDF (2658KB) ( )  
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    The pore size distribution (PSD) measured by the gas bubble point (GBP) method of ceramic microfiltration (MF) membranes
    prepared by suspension technique was found to be significantly influenced by the membrane thickness. A culm-like model for
    pore structure was introduced to characterize the membrane pores instead of the conventional model which does not reflect the
    radius variation along the pore passages and is unable to explain the thickness effect on the membrane PSD. A laminate
    structure, taking the culm-like model for pore structure into consideration, was hypothesized for ceramic MF membranes. A
    mathematical model was then established to quantitatively describe the relationship between the membrane number PSD and the
    membrane thickness. Good results were obtained for the correlation of mean pore size and simulation of the PSD for ceramic MF
    membranes.
    A General Equation for Calculating the ’True’ Height of Transfer Unit in Extraction Columns
    Luo Guangsheng, Li Hongbo, Fei Weiyang, Wang Jiading
    1998, 6(3):  233-238.  doi:
    Abstract ( )   PDF (1207KB) ( )  
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    Based on single drop mass transfer models and two phase flow equation, a general equation for calculating the ’true’ height
    of transfer unit of extraction columns was derived and tested with four types of extraction columns with some different
    working systems. The calculated results fitted well with those obtained by experiments.
    The Solubility of Styrene from Polystyrene in Supercritical CO2
    Jiang Chunyue, Pan Qinmin, Pan Zuren
    1998, 6(3):  239-247.  doi:
    Abstract ( )   PDF (2053KB) ( )  
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    The solubility of styrene from polystyrene in supercritical carbon dioxide is measured at 323 K, 333 K, and 343 K in the
    pressure range from 12 to 28 MPa. Based on the association concept and the theory of dense gas sorption in polymers, a
    displacement and association mechanism on supercritical fluid extraction of the monomer from the polymer is proposed. And, a
    novel mathematical model for correlating the solubility data obtained from the experiments is also proposed in the paper.
    Kinetic Correlation for the Hindered Diffusion of Proteins in a Porous Packing Column*
    Yu Zhaoxiang, He Zhimin
    1998, 6(3):  248-256.  doi:
    Abstract ( )   PDF (1898KB) ( )  
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    Hindered diffusion of proteins in a porous packing plays an important role in protein chromatographic purification. The HETP
    method was adopted to analyze the influence of axial dispersion, film mass transfer and hindered diffusion in the porous
    packing employing a size-exclusion chromatography (SEC) process. The retention behavior with eight proteins of different
    relative molecular mass was experimentally detected with a commercial SEC column. A correlation based on the relative
    molecular mass of the proteins and the packing porosity was developed and used to predict the effective diffusion coefficient
    of a protein in the porous packing. The predicted values of effective diffusion coefficient were very consistent with the
    experimental results with the average error of 8.6%.
    RESEARCH NOTES
    A Statistical Thermodynamic Model of Vapor-Liquid Interfacial Tension for Liquid Mixtures at High Pressure
    Li Zhibao, Lu Jiufang, Li Yigui
    1998, 6(3):  257-263.  doi:
    Abstract ( )   PDF (1441KB) ( )  
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    A Novel Constitutive Equation for Viscoelastic-Thixotropic Fluids and its Application in the Characterization of Blood
    Hysteresis Loop
    Fang Bo, Jiang Tiqian
    1998, 6(3):  264-270.  doi:
    Abstract ( )   PDF (1403KB) ( )  
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    Approximate Expressions to Evaluate the Performance in Butene-1 Purification Units
    Sergio P.Bressa, Nestor O.Ardiaca, Osvaldo M. Martinez, Guillermo F.Barreto
    1998, 6(3):  271-276.  doi:
    Abstract ( )   PDF (1282KB) ( )  
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    Using Process Energy Integration Technology in the Energy-Saving Retrofit of Large-Scale Complex Chemical Process System
    Li Huiquan, Yao Pingjing
    1998, 6(3):  277-282.  doi:
    Abstract ( )   PDF (1678KB) ( )  
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