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  • 1
    Digitale Medien
    Digitale Medien
    Design of the control scheme of a concentration-controlled recycle reactor (1988)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 27 (1988), S. 86-93 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie00073a017
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  • 2
    Digitale Medien
    Digitale Medien
    Vapour-liquid equilibria of hydrogen/coal liquid and methane/coal liquid systems at elevated temperatures and pressures (1989)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 12 (1989), S. 280-288 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A cubic equation of state is modified in such a way that prediction of PVT data from 40 model compounds, typical of coal oil, becomes possible with an absolute mean deviation of less than 2% for saturated liquid volumes and vapour pressures 〉 1 bar. Additional correlations for binary interaction parameters are obtained by an optimization procedure using vapour-liquid euilibrium (VLE) data from known heavy hydrocarbon liquid/light gas systems. When the modified equation is applied to coal-derived liquids, only specific gravity and boiling analysis data of the coal liquids are required, primarily in order to determine the equation-of-state parameters. The proposed equation is shown to allow a good prediction of VLE data for systems consisting of wide-boiling-range coal oils and light gases. Experimental values were obtained at elevated temperatures and pressures with a circulation flow apparatus.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270120139
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  • 3
    Digitale Medien
    Digitale Medien
    Deactivation kinetics and modelling of coke removal under supercritical conditions for the example of ethylbenzene disproportionation (1995)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 18 (1995), S. 278-283 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Deactivation kinetics and coke removal kinetics were derived from experimental studies on the disproportionation of ethylbenzene with a protonated Y-faujasite (Z-14) in a loop reactor under supercritical conditions. Derivation of the steady state kinetics of ethylbenzene disproportionation permitted determination of the catalyst activity. At small educt mole fractions of ethylbenzene, owing to the modest removal of coke the deactivation kinetics can be described by a power relationship. The rate of coke removal can be correlated with the activity and the deactivation rate of the catalyst.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270180409
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  • 4
    Digitale Medien
    Digitale Medien
    Kinetic modelling of zinc liberation from zinc sulphide-containing sludges in the viscose industry (1995)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 18 (1995), S. 260-268 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Large quantities of sludge containing considerable amounts of zinc are obtained on treatment of waste water from the production of viscose fibres for textiles and industrial applications. A process has been proposed [7, 10] for the recovery of zinc from one such sludge, in the first step of which zinc is transferred to the liquid phase with liberation of hydrogen sulphide. In connection with this work a model was developed which provides a kinetic description of zinc liberation from various sludges and the parameters of this model fitted to the measured data by means of linear regression.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270180407
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  • 5
    Digitale Medien
    Digitale Medien
    Coke removal from a zeolite catalyst by supercritical fluidsDedicated to Professor Karl. H. Simmrock on the occasion of his 60th birthday (1991)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 14 (1991), S. 73-78 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: In the study of the possible coke removal from zeolite catalysts, the solubility of polyaromates in supercritical fluids (SCF) was determined, showing that it becomes drastically reduced with increasing molar mass. Experiments with supercritical ethyl benzene and benzene showed that only coke precursors can be dissolved and, therefore, complete coke removal by SCF is impossible but it has been confirmed that, under supercritical conditions, deactivation of the catalyst could be slowed down.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270140111
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  • 6
    Digitale Medien
    Digitale Medien
    A fluid-dynamically based model of bubble column reactorsPaper presented by H.-E. Gasche at the “Jahrestreffen der Verfahrens-Ingenieure”, Berlin, September 27 to 29, 1989. (1990)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 13 (1990), S. 341-349 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A heterogeneous fluid dynamic model has been developed to describe the complex flow structure of two-phase in bubble columns. The equation of continuity and momentum balances form the basis of the model. Coupling of the two phases occurs via an interaction force, deduced by a force balance around a single rising bubble. Multiphase flow mixing processes are taken into consideration by introducing turbulent viscosities of the two phases involved. The Simulation program was extended to reactive system, taking into account the mass balances of a second order gas-liquid chemical reaction as well as the different absorption/reaction regimes. The gas phase concentration profiles show pronounced axial and radial dependences, while the liquid phase can be regarded as a CSTR with respect to the liquid component. With reference to the gaseous component, which is being absorbed in the liquid phase, the degree of back mixing does not show CSTR behaviour as the influence of different absorption conditions in different axial and radial reactor positions is superposed on that of turbulent motion of the liquid carrier of the dissolved gaseous component.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270130147
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  • 7
    Digitale Medien
    Digitale Medien
    Hydrogenation of 3-hydroxypropanal in trickle beds  -  experimental and modelling (1997)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 20 (1997), S. 131-137 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Hydrogenation of 10% aqueous solution of 3-hydroxypropanal (HPA) was adiabatically carried out over cylindrical Ni/SiO2/Al2O3-catalyst pellets (∅ 0.8 + 5 mm) in a trickle bed (∅ 76 × 5200 mm) at 2.6 to 8.0 MPa. The concentration and temperature profiles in the trickle-bed were measured at different flow rates of liquid. A mathematical model was developed under consideration of heat transfer, interphase mass transfer, intraparticle diffusion and deactivation of catalyst pellets at partial wetting with different wetting geometries. The model fits the measured data satisfactorily when its kinetics of deactivation is modified by a factor determined by regression of data measured in the trickle bed.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270200210
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  • 8
    Digitale Medien
    Digitale Medien
    Zur Vorhersage möglicher Ausbeuteverbesserungen bei periodischer Reaktionsführung im Rührkessel (1984)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 56 (1984), S. 137-140 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330560215
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  • 9
    Digitale Medien
    Digitale Medien
    Ermittlung sicherheitstechnischer Kenngrößen explosionsfähiger GasgemischeVortrag von H. Hofmann auf dem Jahrestreffen der Verfahrens-Ingenieure, 28. bis 30. Sept. 1983 in Nürnberg. (1984)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 56 (1984), S. 180-186 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Determination of safety characteristics for explosive gas mixtures. This paper presents equipment for determining safety characteristics such as explosion limits, flame temperatures, and laminar flame velocities. Contactless methods of measurement such as infrared thermography, interferometry, and Laser-Doppler anemometry are of particular importance. By means of selected gas mixtures it is shown that the composition of the gas mixture, the initial temperature and, as far as explosion limits are concerned, also the type of ignition source are important parameters. Finally, the influence of additives is reported which even in relatively small quantities strongly modify the whole combustion process and are therefore also relevant in safety problems.
    Zusätzliches Material: 18 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330560303
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  • 10
    Digitale Medien
    Digitale Medien
    Untersuchungen zur heterogenkatalytischen Dehydrochlorierung von 1.1-Difluor-1-chlorethan (1984)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 56 (1984), S. 626-628 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330560815
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