X-ray tomography; Modular Packing; Hydrodynamics; Liquid load point
Abstract :
[en] In this paper, we report on the use of Xray
tomography to determine the liquid load point in 0.1m diameter modular catalytic distillation
packings KatapakSP11
and KatapakSP12.
The liquid load point corresponds to the overall packed bed liquid load above which there is
an increment in the liquid flowing outside the catalytic baskets and the catalytic baskets themselves are saturated with liquid. From tomographic
images, we show that several factors affect the wetting and filling of catalytic baskets. The complex hybrid structure of catalytic
packings influences the liquid distribution inside the elements. The liquid preferentially fills the external catalytic baskets because they receive
the liquid not only from the packing element situated above but also from the wall wipers. Moreover, liquid holdup
inside a catalytic
basket section depends significantly on the vertical position in the packing element and on the position of the packing in the column
packed bed. The counter–current gas flow speeds up the process of liquid filling of the baskets, also for low liquid loads. The nonuniform
distribution of liquid in catalytic basket which is observed experimentally makes the identification of a unique liquid load point not straightforward. [fr] Nous donnons dans ce document un compte rendu de l’utilisation de la tomographie `a rayon X dans la d´etermination du point de chargement
du liquide dans les ´el´ements modulaires de distillation catalytiques de 0,1m de diam`etre KatapakSP11
et KatapakSP12.
Le point de chargement
du liquide correspond `a la charge liquide d’un lit fixe rempli audessus
de laquelle il y a un incr´ement dans l’´ecoulement du liquide hors des
paniers catalytiques et les paniers catalytiques sont euxm
ˆemes satur´es de liquide. Nous d´emontrons, `a partir des images tomographiques, que
plusieurs facteurs affectent la fluidisation et le remplissage des paniers catalytiques. La structure hybride complexe des ´el´ements de lit catalytique
influence la distribution du liquide `a l’int´erieur des ´el´ements. Le liquide remplit pr´ef´erentiellement les paniers catalytiques externes parce qu’ils
rec¸oivent le liquide non seulement de l’´el´ement du lit se trouvant audessus
mais ´egalement des pales raclantes des parois. En outre, la retenue
de liquide `a l’int´erieur d’une section du panier catalytique d´epend de mani`ere significative de la position verticale dans l’´el´ement du lit et de la
position de l’´el´ement dans le lit rempli. L’´ecoulement de gaz `a contre courant acc´el`ere le processus du remplissage du liquide dans les paniers,
aussi pour les charges liquides faibles. La distribution non uniforme du liquide dans le panier catalytique qui est observ´ee exp´erimentalement fait
que l’identification d’un point de chargement unique n’est pas si simple.
Disciplines :
Chemical engineering
Author, co-author :
Aferka, Saïd ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires
Viva, Aurora ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires
Brunazzi, Elisabetta; University of Pisa > Laboratory of Chemical Engineering
Marchot, Pierre ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Systèmes polyphasiques
Crine, Michel ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires
Toye, Dominique ; Université de Liège - ULiège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Language :
English
Title :
Liquid load point determination in a reactive distillation packing by x-ray tomography
Publication date :
2010
Journal title :
Canadian Journal of Chemical Engineering
ISSN :
0008-4034
Publisher :
Chemical Institute of Canada, Ottawa, Canada
Volume :
88
Issue :
4
Pages :
611-617
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
ARC - Actions de recherche concertées; Techniques Expérimentales Avancées et Modélisation par Automates Cellulaires de Systèmes Multiphasiques - Application aux colonnes de distillation et de distillation réactive
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