Dynamics of a three-phase upflow fixed-bed catalytic reactor

✍ Scribed by C. Julcour; F. Stüber; J.M. Le Lann; A.M. Wilhelm; H. Delmas

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 457 KB
• Volume: 54
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/s0009-2509(98)00304-2

✦ Synopsis

A dynamic model of an up#ow "xed-bed catalytic reactor is developed to examine numerically transient axial temperature and concentration pro"les obtained for the consecutive hydrogenation of 1,5,9-cyclododecatriene on a Pd/Al O catalyst. This nonisothermal heterogeneous model includes the resistances to heat and mass transfer at the gas}liquid and liquid}solid interfaces, as well as the heat exchange through the jacket of the reactor. The predictions of the model are compared to experimental data for various gas and liquid #ow rates to describe dynamic events, such as the start-up of the reactor and the e!ects of sudden changes in the operating conditions on the reactor behaviour and its thermal stability. The predicted transient pro"les are in good agreement with the experimental measurements. Still, the dynamic model is not able to correctly predict hot spots and runways experimentally observed at very high hydrogen #ow rates.