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Publication Type: search.filters.UBSTyp.KonferenzbeitragAuthor: search.filters.author.Eigenberger, Gerhart

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Now showing 1 - 5 of 5
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    Direct electrodialysis of fermentation broth with periodic removal of fouling layers
    (1992) Kuppinger, Franz-Felix; Busch, Claudia; Eigenberger, Gerhart
    In the present investigation the fermentation broth is fed directly into the electrodialysis module without prefiltration. Under these conditions a biofouling layer of living and dead parts of the fermentation broth builds up primarily on the anion exchange membranes. The mainly negatively charged fouling producers, for example protein ions, are transported by the electric field to the anion exchange membranes.
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    Influence of the wall on the dynamic behavior of homogeneous tubular reactors with a highly exothermic reaction
    (1974) Eigenberger, Gerhart
    The influence of the tube wall on the behavior of tubular reactors with a highly exothermic reaction was studied. The effect of heat accumulation in the wall has a considerable influence upon the transient behavior of the reactor. Because of this influence excess temperatures can occur if the feed temperature is lowered or the flow velocity is raised. For a gas phase reaction the transient behavior is determined almost completely by the heat capacity of the wall. An example of multiple steady states caused by axial heat conduction in the wall is given, and the influence of heat conduction in the wall is compared with that in the reaction mixture.
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    Kinetic instabilities in catalytic reactions : a modelling approach
    (1976) Eigenberger, Gerhart
    It is the purpose of this contribution to show under which conditions relatively simple Langmuir-type rate mechanisms exhibit steady state multiplicity as well as periodic instabilities and may serve as models for experimentally observed phenomena.
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    Investigation and control of fermentation processes using fermenter calorimetry
    (1992) Meier-Schneiders, Martin; Grosshans, Ulrich; Busch, Claudia; Eigenberger, Gerhart
    It is well known, that heat generation and total metabolic activity in biological systems are strongly correlated. Thus the heat production can provide important information for the study, supervision and control of biological fermentations. Microcalorimeters are widely used for studies concerning physiology, ecology, and pharmacology. They are very sensitive, but the measuring principle exhibits methodical disadvantages for its application in biotechnology (direct control of the fermentation inside of the measuring cell and sampling is impossible). Reaction calorimeters used in chemistry are too insensitive for the detection of small changes in heat generation. Therefore, we developed a new isothermal heat-flux calorimeter-fermenter with a working volume of 2l. The detection level for heat generating processes is 10 mW/l under standard fermenting conditions including agitation, aeration and pH-control. In situ sterilization of the apparatus can be handled easily. The calorimeter is thought to be a versatile tool for laboratory optimization of a fermentation. The aim of the presented work is to discuss what results have been obtained so far and how the heat signal can be used advantangeously in biotechnology.
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    Vom Einzelkorn zum großtechnischen Reaktor : Aufgaben und Möglichkeiten der Modellbildung von Festbettreaktoren
    (1989) Eigenberger, Gerhart
    Aus dem großen Bereich der Modellierung disperser zweiphasiger Reaktionssysteme ist die Modellierung von Festbettreaktoren sicher am weitesten fortgeschritten. Das Wissen darüber ist bereits in Lehrbüchern hinreichend dokumentiert und wird in der Praxis zunehmend für die stationäre Auslegung und für die Untersuchung des dynamischen Betriebs eingesetzt.In diesem Beitrag soll anhand einiger Beispiele darauf eingegangen werden, in welcher Richtung sich dieses Fachwissen vermutlich in der nächsten Zeit weiter vertiefen wird und welche Fragestellungen für die Praxis weiter an Bedeutung gewinnen können. Die Beispiele betreffen das Zusammenspiel von Stofftransport und Mehrschrittreaktion im porösen Katalysatorkorn und die Reaktlonsführung im katalysatorgefüllten Rohr.