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  • Chemical Engineering  (8)
  • 1995-1999  (4)
  • 1970-1974  (2)
  • 1960-1964  (2)
  • 1945-1949
  • 1
    Electronic Resource
    Electronic Resource
    Ignition and extinction in the catalytic oxidation of hydrocarbons over platinum (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 1077-1087 
    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 ignition-extinction behavior in the oxidation of methane, ethane, propane and isobutane, as well as of ethylene and propylene over a platinum-foil catalyst was studied over the entire range of fuel/air ratios at atmospheric pressure. Ignition and extinction of the heterogeneous surface reaction, homogeneous ignition and the autothermal behavior of these fuel-air mixtures were investigated. The results show a common trend in the ignition extinction behavior of the alkanes and a different trend for the olefins. This is discussed in terms of a simple model, which correctly predicts the composition dependence of the surface ignition curve for reasonable values of parameters, indicating a mainly oxygen-covered surface during ignition of the alkanes and a mainly hydrocarbon-covered surface in the case of the olefins. Different branches of the complete bifurcation diagrams are discussed separately, allowing qualitative conclusions about the catalytic activity of Pt for the oxidation reactions of different fuels.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420418
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  • 2
    Electronic Resource
    Electronic Resource
    Elementary step model of ethane oxidative dehydrogenation on Pt-coated monoliths (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 3484-3497 
    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 oxidative dehydrogenation of ethane to ethylene over Pt-coated foam monoliths in oxygen with varying levels of nitrogen dilution has been simulated using a 24-stepmodel of adsorption, desorption and surface reactions. Reaction parameters for these elementary steps were obtained from surface science and catalysis literature or fit to previously reported experimental data. The model agrees with the experimental data remarkably well, mimicking the selectivity and conversion trends observed experimentally with changing operating conditions. The model shows that a purely heterogeneous mechanism can be used to simulate the experimental results collected near atmospheric pressure accurately, suggesting that the mechanism we propose is sufficiently accurate to capture the main features of this reaction system. This model can also be used to examine this reaction system under conditions experimentally inaccessible. Application of this predictive ability to operation of this type of reactor under probable industrial conditions suggests that excellent ethylene yields are possible.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690421218
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  • 3
    Electronic Resource
    Electronic Resource
    Micromachined reactors for catalytic partial oxidation reactions (1997)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 43 (1997), S. 3059-3069 
    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: Silicon-based microfabrication of a novel chemical reactor (microreactor) having submillimeter flow channels with integrated heaters, and flow and temperature sensors is described. The potential application of this reactor to partial-oxidation reactions is explored by using Pt-catalyzed NH3 oxidation as a model reaction. Investigation of reactor behavior as a function of operating conditions shows that conversion and selectivity behavior of conventional laboratory reactors can be reproduced and demonstrates the feasibility of conducting chemical reactions in microfabricated systems. Ignition-extinction behavior is explored, along with high-temperature microreactor materials degradation. Potential applications and scale-up of microreactors are also discussed.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690431117
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  • 4
    Electronic Resource
    Electronic Resource
    Laminar flows in tubes with step changes in cross section (1971)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 1248-1250 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690170538
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  • 5
    Electronic Resource
    Electronic Resource
    Use of adiabatic experiments for kinetic studies in fixed catalyst beds (1964)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 10 (1964), S. 149-154 
    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 method is presented for using an adiabatic reactor to study the kinetics of reactions of gases on solid catalysts. The method is based on measurement of the steady state axial profile of temperature or composition in a specially designed adiabatic packed bed reactor. Reaction rates are calculated from these measured profiles by graphical differentitation. The method is applicable for multireaction systems and for any type of kinetic behavior.The method was demonstrated by an experimental study of cumene cracking an silica-alumina catalyst at 420° to 480°C. The measured reaction rates are in satisfactory agreement with results obtained by other investigators who used isothermal reactors. Areas of application of the adiabatic method are suggested.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690100205
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  • 6
    Electronic Resource
    Electronic Resource
    A special mold and tracer technique for studying shear and extensional flows in a mold cavity during injection molding (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 797-800 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A specially-designed mold with interchangeable cavity plates was built and used with an Instron capillary rheometer, type MCR, to investigate the injection molding process. Flow patterns in the mold cavity were illustrated with a visual tracer technique. The complete deformation history of the tracers was recorded on a motion picture for several runs. The flow patterns provide data for computing the components of the rate-of-deformation tensor which is used to identify specific shear and extensional flows. The tracer marks in the cross section of a molding offer information on the skin thickness and the dimensions of the core channel.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760141111
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation methods for ablative plastics. A review of the techniques used (1963)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 3 (1963), S. 238-250 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A determination of the performance indices of ablative plastics is indeed a formidable task because of the severity of the high-temperature test environment, nonstandard test methods, limitations of available evaluation facilities and the complex interrelationship between materials performance and environmental parameters. In spite of these difficulties, considerable progress has been made in establishing new test methods for evaluating very high-temperature (ablative) plastics. This article describes the test facilities and measurement techniques available for obtaining research and design data on ablative plastics.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760030403
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  • 8
    Electronic Resource
    Electronic Resource
    Fully quantitative predictive maintenance/inspection planning optimization for chemical process plant components (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Process Safety Progress 16 (1997), S. 262-268 
    Details
    ISSN: 1066-8527
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Predictive maintenance/inspection planning and fitness-for-service analyses are being applied more frequently to address the effect of component aging affecting plant reliabibility. Component aging is one of the critical issues in an increasingly competitive environment, especially in plant components built and installed during the 50s and 60s. Maintenance optimization is also a critical issue for components, such as those that operate in the creep regime, and therefore age quickly. Maximizing the value received for each predictive maintenance/inspection dollar is the key. This article introduces the use of decision analysis to unite engineering analysis and economic evaluation for decision making. To illustrate this idea, examples of this approach applied to chemical facility components will be presented. In addition, the concept of priority-ranking multiple component maintenance/inspectio projects having maintenance budget and safety constraints in a way that maximizes Net Present Value, will be presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prs.680160411
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