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  • 1
    Electronic Resource
    Electronic Resource
    The influence of axial dispersion on carbon dioxide absorption tower performance (1966)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 12 (1966), S. 541-548 
    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: Carbon dioxide was absorbed from mixtures with nitrogen by countercurrent contact with water in an experimental packed tower. Radial and axial gas concentration profiles were determined from measurements made within the packing. Substantial gas phase channeling was observed. Characterizing the gas flow regime by both piston flow and axial diffusion models yielded mass transfer data and computed axial gas concentration profiles. Differences between the mass transfer results for the two models allowed the influence of axial dispersion to be assessed. Comparison of the piston flow and axially dispersed profiles with the experimental profiles enabled conclusions to be drawn regarding the applicability of the axial diffusion model and the accuracy of available dispersion parameter values.The axial diffusion model appears to be a satisfactory representation of the process. The dispersion coefficients used were found to be too high, which emphasizes shortcomings in the transient response experiments yielding dispersion coefficients. The influence of dispersion on the performance was found to be only moderately adverse. The effect increases with increasing liquid rate, decreasing gas rate, and decreasing packing height. It is improbable that the effect is large enough to account for the difference between industrial scale performance and that predicted from available mass transfer correlations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690120327
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  • 2
    Electronic Resource
    Electronic Resource
    Gas phase axial mixing at extremely high irrigation rates in a large packed absorption tower (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 1003-1009 
    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: Extensive gas phase dispersion data are reported for extremely high liquid-gas ratios in a cylindrical packed absorption tower operated at atmospheric pressure under counterflow conditions.The dispersion data report gas Peclet numbers in terms of superficial liquid and gas Reynolds numbers over the range \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} 0 & 〈 & {N{\mathop{\rm Re}\nolimits} _{\rm L} } & 〈 & {1500} \\ {15.0} & 〈 & {N{\mathop{\rm Re}\nolimits} _{\rm S} } & 〈 & {500} \\ \end{array} $$\end{document}An increase in Peclet number with increasing gas rate is observed at subloading conditions.Reverse gas flow was observed in the gas phase when the liquid Reynolds number exceeded 650. Dispersion in the gas phase at liquid rates for which NReL 〈 650 is consistent with previously recorded correlations but becomes independent of further increases of liquid rate when NReL is 〉 650.The dispersion coefficients obtained by dynamic testing under reverse gas flow conditions were consistent with those obtained from steady state absorption profiles and provide a quantitative explanation for the anomalies in plug-flow KLa at high water rates recorded by Sherwood and Holloway (1940).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690200523
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mixing and mass transfer at high liquid rates in the steady state counterflow operation of packed columns (1978)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 24 (1978), S. 187-192 
    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: Carbon dioxide absorption profiles have been measured for high liquidgas ratios in an absorption column operated at atmospheric pressure under steady state counterflow conditions. Mixing and mass transfer parameters were extracted from these profiles using an extension of the technique described by Brittan (1967). The flow ranges covered are 15 〈 Res 〈 100 and 300 〈 ReL 〈 1 600.The dispersion data reflect the same trends as shown by dynamic testing methods (Woodburn, 1974). However, with decreasing liquid-gas ratios the effect of dispersion on steady state mass transfer becomes less significant than would be inferred from dynamic testing results.Under reverse gas flow conditions, the mass transfer coefficients corrected for the effects of axial dispersion show the same functional dependency on liquid rate as given by the Sherwood and Holloway (1940) correlation and provide a quantitative explanation for the anomalous behavior exhibited by their results in this liquid range.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690240205
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  • 4
    Electronic Resource
    Electronic Resource
    Prediction of multicomponent ion exchange equilibria for the ternary system SO42--NO3--Cl from data of binary systems (1978)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 24 (1978), S. 577-587 
    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 framework is developed which provides predictions of multicomponent ion exchange equilibria from binary data.Experimental data are reported for the ion exchange equilibria of the binary systems SO42--Cl-, SO42--NO3-, and Cl--NO3- on a strong base anion exchange resin. These systems exhibit nonideal characteristics in both phases, and the experimental characterization has been based on the reaction equilibrium constants and correlations for the activity coefficients in both phases. The exchanger phase activity coefficients are obtained from the well known Wilson (1964) modelThe predictions of the ternary system SO42--NO3--Cl- based solely on the binary data are consistent with the experimental data for this system.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690240404
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    Paper (German National Licenses)
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