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  • 1
    Electronic Resource
    Electronic Resource
    Mass transfer with chemical reaction from single gas bubbles (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 379-383 
    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: Numerical solutions of the equations that describe steady state, forced-convection mass transfer around single circulating or noncirculating gas bubbles have been obtained for both first- and second-order chemical reaction conditions. For the noncirculating bubbles, solutions have been obtained up to Reynolds numbers of 200 with Kawaguti velocity profiles used to describe the flow. In the case of circulating gas bubbles, Kawaguti profiles have been utilized up to Reynolds numbers of 80, while the potential flow velocity profiles have been used for higher Reynolds numbers. The numerical results for circulating gas bubbles have been compared with penetration theory for both first- and second-order chemical reactions. For the case of noncirculating gas bubbles the solutions for physical mass transfer have been compared with the Ranz and Marshall correlation as well as with the results of Griffith and the more recent work of Tsubouchi and Masuda.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130232
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  • 2
    Electronic Resource
    Electronic Resource
    A kinetic model for industrial gas-phase ethylene copolymerization (1990)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 837-850 
    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 dynamic kinetic model describing gas-phase olefin copolymerization using a multiple active site Ziegler-Natta catalyst is presented. This model is capable of predicting production rate, molecular weight, and copolymer composition changes observed in an industrial reactor. The model also explains how broad molecular weight distributions and bimodal copolymer compositions can occur as has been observed for commercial linear polyethylenes.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690360605
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  • 3
    Electronic Resource
    Electronic Resource
    Mass transfer inside drops (1960)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 145-149 
    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 transfer rates of n-butanol, cyclohexanol, and ethyl acetate into water drops have been measured for circulating and oscillating drops.Methods of allowing for the end-effect transfer have been extended and measured values compared with predictions of a model.Various mechanisms for transfer inside drops have been examined in terms of a correlation factor.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690060128
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  • 4
    Electronic Resource
    Electronic Resource
    Numerical solution of the Navier-Stokes equation for flow past spheres: Part II. Viscous flow around circulating spheres of low viscosity (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 220-224 
    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: Steady state solutions of the Navier-Stokes equations for Reynolds numbers of 0.1, 1, 50, 100, and 200 have been obtained by using finite-difference methods. The effects of radial and angular step size and wall proximity have been investigated. Results were found in the form of stream function and vorticity distributions with pressure distributions and drag coefficients calculated from them. The results compare favorably with experimental data and show a steady trend from Hadamard-Rybczynski flow to boundary-layer flow after Levich-Chao-Moore. For a circulating sphere of low viscosity there is no flow separation indicated at Reynolds numbers equal to or less than 200.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130207
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  • 5
    Electronic Resource
    Electronic Resource
    Polymer reactors and molecular weight distribution: Part I. Free radical polymerization in a continuous stirred-tank reactor (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 1081-1086 
    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: An investigation was made of the simulation of bulk and solution polymerization of styrene in a continuous stirred-tank reactor (CSTR). A theoretical model from the literature was used to predict conversion, molecular weight distribution (MWD), and molecular weight averages. The kinetic rate constants required to solve the model were also taken from the literature.Styrene polymerizations were done at steady state in a laboratory-scale CSTR over a range of experimental conditions. The recently developed gel permeation chromatograph (GPC) was used to measure MWD and average molecular weights. Comparisons were made between the theoretically predicted and experimentally determined values.The effect of solvent was included in the theoretical model but further investigation is necessary before the effects of thermal polymerization, viscosity, and mixing can be included. Where the latter effects were not important, good agreement was obtained between theoretical and experimental values.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130609
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic modeling of emulsion polymerization reactors (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 881-889 
    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: This paper is a survey of recent published works on the dynamic and steady state modeling of emulsion homo- and copolymerization in batch, semicontinuous, and continuous latex reactors. Contributions to our understanding of diffusion-controlled termination and propagation reactions, molecular weight, long chain branching and crosslinking development, polymer particle nucleation, and of the dynamics of continuous emulsion polymerization are critically reviewed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690310602
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  • 7
    Electronic Resource
    Electronic Resource
    Polymer reactors and molecular weight distribution: Part II. Free radical polymerization in a batch reactor (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 1087-1091 
    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 free radical polymerization of styrene in benzene was studied theoretically and experimentally over ranges of monomer and catalyst (AIBN) concentrations and temperature in an isothermal, stirred batch reactor. Molecular weight distributions were measured with a gel permeation chromatograph. Tung's hermite polynomial method was used to correct for imperfect resolution.The differential rate equations have been solved to predict the conversion of monomer and molecular weight distribution of the polymer as a function of time. These solutions were used to interpret the experimental rate data.Good agreement between theory and experiment was found for narrow and broad distribution, provided the variation of the termination constant with solvent concentration was accounted for.The agreement between the experimental and calculated molecular weight distribution suggests the utility of gel pemeation chromatography in the investigation of polymer reaction kinetics.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130610
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical solution of the Navier-Stokes equation for flow past spheres: Part I. Viscous flow around spheres with and without radial mass efflux (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 212-219 
    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: This study was undertaken to ascertain the accuracy of finite-difference solutions for flow around spherical particles in the intermediate Reynolds number range. Comparison of the results with experimental data on drag coefficients, frontal stagnation pressure, and wake geometry indicated good agreement. The approximate solutions, in which the Galerkin method and asymptotic analytical predictions were utilized, were evaluated by using the finite-difference solutions as a standard. These methods were used to calculate the effect of uniform and nonuniform mass efflux on the drag and flow characteristics around a sphere. Theoretical solutions indicated that nonuniform mass efflux can significantly reduce the drag on a submerged object. Ranges of applicability of the approximate methods were established.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130206
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  • 9
    Electronic Resource
    Electronic Resource
    Newly proposed relationship between peak dispersion coefficient and width of the experimental chromatogram based on theories of proposed instrumental spreading shape function in size exclusion chromatography (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 172 (1989), S. 1-14 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die von Omorodion und Hamielec kürzlich vorgeschlagene Funktion zur Beschreibung der apparativ bedingten Verbreiterung von Chromatogrammpeaks, wurde auf die Ausschlußchromatographie angewendet, wobei die Verbreiterung durch einen Peakdispersionskoeffizienten beschriben wird. Diese neuen theoretischen Entwicklungen wurden auf eine Serie von Dextran-Standards/GPC-10-Systemen angewendet.
    Notes: The newly proposed instrumental spreading shape function (ISF) of Omorodion and Hamielec1, has been evaluated in a more recent publication2. It has now been applied to reveal the peak broadening capabilities of peak dispersion coefficient in aqueous size exclusion chromatography (SEC), as it relates to the width of the experimental chromatogram. These new theoretical developments have been employed on series of dextran standards/CPG-10 systems.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051720101
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of pore dispersion and polymer/surface interaction on peak dispersion phenomenon in size exclusion chromatography (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 15-35 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Aufbauend auf die von Omorodion und Hamielec1 vorgeschlagene Funktion zur Beschreibung der apparativ bedingten Verbreiterung von Chromatogrammpeaks (ISF) und die neuen theoretischen Entwicklungen auf dem Gebiet der Peakdispersionsphänomene2 behandelt diese Arbeit einige nicht inhärent dazu beitragende Ursachen für das Peakdispersionsphänomen in der Größenausschlußchromatographie (SEC). Selbst wenn die Wahl einer geeigneten mobilen Phase für ein bestimmtes Polymeres/Packungsmaterial3-5 getroffen worden ist, bleibt die Optimierung des Systems hinsichtlich einer minimalen Peakverbreiterung sehr wichtig. Die wesentlichsten hier diskutierten Ursachen sind der Einfluß der Porendiffusion (große Poren) und die Wechselwirkungen zwischen Polymerem und kleinen Poren/Oberflächen- großie, die aus der traditionellen Anordnung der Kolonnen resultiert. Die verwendeten Systeme bestanden aus Dextran/CPG, als Packungsmaterialien wurden auchnoch Bio-Glas (BG) und EM-Gel (EM), beide mit groner Porengrofle, verwendet.
    Notes: Based on the newly proposed instrumental spreading shape function (ISF) of Omorodion and Hamielec1 and the new theoretical developments on peak dispersion phenomenon2, the present study reported herein deals with some of the non-inherent contributing sources to peak dispersion phenomenon in SEC. Despite when the choice of a suitable mobile phase has been accomplished for a particular polymer/packing material system3-5, the need to optimize the system for minimum peak broadening is still very important. The major contributing sources discussed here are the roles of pore dispersion (large pores) and polymer/small pore-size surface area interactions resulting from the traditional method of column arrangements. The systems employed in the study are dextran/mostly CPG systems. Other packing materials employed included Bio-glass (BG) and EM-gel (EM), both of large pore size range.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051730102
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