Bitte benutzen Sie diese Kennung, um auf die Ressource zu verweisen: http://dx.doi.org/10.18419/opus-7142
Autor(en): Weng, Hung Shan
Eigenberger, Gerhart
Butt, John B.
Titel: Catalyst poisoning and fixed bed reactor dynamics
Erscheinungsdatum: 1975
Dokumentart: Zeitschriftenartikel
Erschienen in: Chemical Engineering Science 30 (1975), S. 1341-1351
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-51466
http://elib.uni-stuttgart.de/handle/11682/7159
http://dx.doi.org/10.18419/opus-7142
Zusammenfassung: The poisoning kinetics of thiophene on Ni-kieselguhr catalysts and the deactivation behavior of nonisothermal fixed bed reactors have been studied experimentally using benzene hydrogenation as a model exothermic reaction. The time dependent axial temperature profiles in the reactors were measured and compared with values evaluated from a dispersion model, the parameters of which have been determined in separate experimentation. Poisoning kinetics were measured in a series of differential reactor experiments at atmospheric total pressure, thiophene partial pressures of 0·037-0·19 torr, hydrogen to benzene molar ratios >8/1 and temperatures from 60-180°C. Excellent agreement was found with a power law equation for the rate of change of activity with time, first order in catalyst activity and in thiophene concentration, with an experimental activation energy of 1080 kcal/kmole. This correlation of poisoning kinetics, however, was not able to predict the propagation of the zone of activity (hot-spot) on poisoning of an integral fixed bed reactor. Initial (steady state) temperature profiles were modeled satisfactorally, but the rate of migration of the hot spot was found experimentally to be more rapid than that predicted from the correlation of poisoning kinetics. A semi-empirical two site deactivation model is shown to resolve the discrepancy.
Enthalten in den Sammlungen:15 Fakultätsübergreifend / Sonstige Einrichtung

Dateien zu dieser Ressource:
Datei Beschreibung GrößeFormat 
eig31.pdf4,3 MBAdobe PDFÖffnen/Anzeigen


Alle Ressourcen in diesem Repositorium sind urheberrechtlich geschützt.