Hydrodynamic Properties of the Fischer-Tropsch Slurry Process

Deckwer, Wolf‐Dieter; Louisi, Youssef; Zaidi, Ahmed; Rálek, M.

doi:10.1021/i260076a032

Cited by 236 publications

(251 citation statements)

References 16 publications

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“…This is confirmed by, for example, Ruzicka et al (2001) and Voigt (Voigt and Schügerl, 1979). However, there seems to be no influence by the liquid height on the holdup for large aspect ratios, as reported by other investigators (Deckwer et al, 1980;Godbole et al, 1984;Hikita and Kikukawa, 1974). It is generally admitted that holdup is independent of aspect ratio for columns in which the aspect ratio is higher than 5 (Kantarci et al, 2005).…”

Section: Comparison With Data From the Literaturesupporting

confidence: 64%

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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Section: Comparison With Data From the Literaturesupporting

confidence: 64%

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

117

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“…The hydrodynamic behavior of bubble columns is strongly dependent on the flow regime (Deckwer et al, 1980). Commercial reactors are usually operated at high gas velocity, i.e.…”

Section: Phenomenology Of a Slurry Bubble Columnmentioning

confidence: 99%

Scale Up of Slurry Bubble Reactors

Forret¹,

Schweitzer²,

Gauthier³

et al. 2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Extrapolation des réacteurs slurry -Les réacteurs à colonne à bulles trouvent de plus en plus d'applications dans l'industrie. Ils sont particulièrement appropriés pour mettre en oeuvre des réactions très exothermiques, telles que la synthèse du méthanol ou la synthèse Fischer-Tropsch de conversion du gaz de synthèse en paraffines liquides. Les procédés industriels requièrent des réacteurs de gros volumes, dont le diamètre peut atteindre 10 m, équipés d'échangeur de chaleur interne (tubes verticaux) afin de contrôler la température de réaction. La présente étude a pour objet la compréhension des effets de taille et de la présence des internes sur les caractéristiques hydrodynamiques pour contribuer à l'élaboration des règles d'extrapolation aux conditions industrielles des réacteurs slurry à partir d'expériences menées en maquettes froides.Notre étude montre que l'intensité de la recirculation liquide augmente fortement avec le diamètre de la colonne alors que le taux de vide n'est que peu affecté. Deux méthodes sont proposées pour prédire l'effet de taille sur la vitesse liquide : une corrélation empirique tirée de la littérature ainsi qu'un modèle phénoménologique. Les tubes verticaux (simulant des échangeurs de chaleur) guident axialement la circulation liquide, favorisant le transport convectif et diminuant les fluctuations de vitesse. Le mélange du liquide est alors significativement affecté par la présence des internes. Il ne peut plus être décrit correctement par le modèle standard mono dimensionnel de dispersion axial. Un modèle bidimensionnel, prenant en compte le profil radial de la vitesse liquide ainsi que la dispersion axiale et radiale est donc développé pour représenter le mélange du liquide dans une colonne à bulles avec internes. Abstract

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“…Kinematic viscosity of the liquid-solid suspension was calculated from the following expression due to Deckwer et al (1980):…”

Section: Permeate Fluxmentioning

confidence: 99%

Hydrodynamics of the continuously filtering slurry reactor — Influence of load of solids and particle size distribution

Huizenga

Kuipers²,

Swaaij

1997

Chemical Engineering Science

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Abstract--lnternal filtration in slurry bubble columns offers a possible solution to the filtration problems related to this reactor type. The applicability of the concept has already been demonstrated at full-scale for waste water treatment. Theoretical description of internal filtration is lacking, however.In previous work it was derived on basis of two different models, that in three-phase filtration solids concentration in the vicinity of the filter should uniquely depend on a single dimensionless number, i.e.The validity of the so-called cake build-up number was demonstrated by determining filter cake resistance as an indirect measure of solids concentration for a system in batch operation with respect to solids.In the present work the force balance model is extended to include the effect of particle size distribution. It is demonstrated that particle polydispersity can explain trends observed upon variation of load of solids, which cannot be understood assuming the particles to be monodispersed. Based on a simplified version of the model including particle polydispersity, a novel diameter characteristic to filtration behaviour of polydisperse solids is derived. Using this novel diameter in the cake build-up number, experimental results for four different size distributions can bc reasonably well described by a single master curve. ~ 1997

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Hydrodynamic Properties of the Fischer-Tropsch Slurry Process

Cited by 236 publications

References 16 publications

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Scale Up of Slurry Bubble Reactors

Hydrodynamics of the continuously filtering slurry reactor — Influence of load of solids and particle size distribution

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