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  • Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Breakthrough curves for fixed-bed adsorbers: Quasi-lognormal distribution approximation (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 979-985 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The quasi-lognormal distribution (Q-LND) approximation was used to predict breakthrough curves in fixed-bed adsorbers for a linear adsorption system with axial dispersion, external film diffusion resistance, and intraparticle diffusion resistance for slab-, cylindrical-, and spherical-particle geometries. The exact solution and parabolic profile approximation were also obtained for different particle geometries. Numerical results show that the Q-LND approximation is a simple and handy solution. It predicts breakthrough curves with an accuracy comparable to the parabolic-profile approximation over a wide range of parameters; compared with the latter, it only takes less than one hundredth the computation time and does not have a convergence problem in numerical calculations. A criterion for the applicability of the Q-LND approximation is suggested. The effect of particle geometries on the breakthrough curves is discussed. A criterion is also provided for the Q-LND approximation to explore the conditions where one should consider this effect on breakthrough curves.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690430413
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A group contribution molecular model of liquids and solutions (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 144-160 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A group contribution molecular model is developed for the thermodynamic properties of polar and nonpolar liquids and their solutions, including energy of vaporization, ρVT relations, excess properties, and activity coefficients. The model is based on the cell theory in which the repulsive forces of molecules are expressed with a modified cell partition function derived from the Carnahan-Starling equation of state for hard spheres. The attractive forces are made up of group pair interaction contributions. Group and interaction properties have been determined for methyl, methylene, hydroxyl, and carbonyl. Extensive comparisons are made of predictions of the model with data for pure liquids and their solutions.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230203
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    Paper (German National Licenses)
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