Forced unsteady‐state processes in heterogeneous catalytic reactors

On analyse les principales techniques d'etude et de conception des procedes catalytiques heterogenes dans des conditions de fonctionnement en regime instationnaire force (FUSO). Les aspects consideres sont les suivants: a) pourquoi les procedes FUSO sont-ils theoriquement plus efficaces que les procedes en regime permanent classiques?; b) comment un procede FUSO peut-il etre concu?; c) le fonctionnement a ecoulement inverse; d) l'oxydation partielle dans un lit fluidise circulant; e) les procedes qui peuvent etre interessants dans des conditions FUSO a l'echelle commerciale, et les raisons pour lesquelles leur emploi ne s'est pas generalise dans l'industrie; f) les systemes FUSO non employes a l'echelle commerciale, tels que la chromatographie de reaction, le cyclage des compositions d'entree, le cyclage des temperatures d'entree; g) que pourrait-on faire pour encourager l'utilisation des FUSO dans l'industrie? Cette etude demontre le nombre considerable de donnees qui ont ete recueillies sur les procedes pour un fonctionnement FUSO. Traduire ces efforts en succes commercial devient possible seulement lorsque les chercheurs comprennent parfaitement les principes fondamentaux du systeme FUSO sur lequel ils travaillent. Un bref examen des recherches passees et actuelles suggere qu'un procede catalytique fonctionnant de maniere optimale en mode FUSO ne sera jamais moins efficace qu'un procede en regime permanent optimale.

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