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Backmixing reduction of a bubble column by interruption of the global liquid circulation / Yang Wu in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6558–6563 Titre : Backmixing reduction of a bubble column by interruption of the global liquid circulation Type de document : texte imprimé Auteurs : Yang Wu, Auteur ; Zhen-Min Cheng, Auteur ; Zi-Bin Huang, Auteur Année de publication : 2009 Article en page(s) : pp. 6558–6563 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Backmixing  reduction  Bubble  column  Lliquid  circulation  route Résumé : The strong backmixing of the liquid phase which is prevalent in a bubble column should be ascribed to its global circulation which is upward in the central region while downward near the wall on the reactor scale. To suppress the backmixing behavior, interruption of the liquid circulation route should be effective. To verify this presumption, an investigation was conducted with a bubble column 550 cm in height and 50 cm in diameter, which was equipped with four channels of the same size installed at different heights so as to cut the downward motion of the liquid and therefore prevent the global circulation the liquid. It shows that although the radial velocity distribution of the liquid remains parabolic in the short column constituted by two neighbor channels, the velocity profile tends to be flat in the upward direction as the channel is approached. The residence time distribution analysis shows that the backmixing of liquid could be reduced by 60% when four channels 12 cm in diameter were applied. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900128j [article] Backmixing reduction of a bubble column by interruption of the global liquid circulation [texte imprimé] / Yang Wu, Auteur ; Zhen-Min Cheng, Auteur ; Zi-Bin Huang, Auteur . - 2009 . - pp. 6558–6563. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6558–6563 Mots-clés : Backmixing  reduction  Bubble  column  Lliquid  circulation  route Résumé : The strong backmixing of the liquid phase which is prevalent in a bubble column should be ascribed to its global circulation which is upward in the central region while downward near the wall on the reactor scale. To suppress the backmixing behavior, interruption of the liquid circulation route should be effective. To verify this presumption, an investigation was conducted with a bubble column 550 cm in height and 50 cm in diameter, which was equipped with four channels of the same size installed at different heights so as to cut the downward motion of the liquid and therefore prevent the global circulation the liquid. It shows that although the radial velocity distribution of the liquid remains parabolic in the short column constituted by two neighbor channels, the velocity profile tends to be flat in the upward direction as the channel is approached. The residence time distribution analysis shows that the backmixing of liquid could be reduced by 60% when four channels 12 cm in diameter were applied. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900128j