Der Einfluß des Partial‐ und Gesamtdruckes auf den Stoffaustausch

Vafopulos, Ilya; Sztatescny, Klaus; Moser, Franz

doi:10.1002/cite.330471609

Cited by 8 publications

(19 citation statements)

References 3 publications

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“…This is in contrast to the findings of Vafopoulos et al [5] who, on taking photographs, found no in-…”

Section: Visual and Photographic Observationscontrasting

confidence: 95%

“…[6] and Kolbel et al [7] in bubble columns at up to 2.0 MPa show no effect of the reactor pressure. The same contradictions were observed in the case of mechanically agitated reactors, where Vafopoulos et al [5] and Albal et al [8,91 found no influence of pressure on the volumetric liquid phase mass transfer coefficient or the interfacial area, while Sridhar and Potter [lo, 1 11 report increases in interfacial area and gas hold-up of as much as 75 % for a pressure increase from 0.1 to 1 MPa. The above mentioned contradictory results can lead to considerable miscalculations, whichever correlation is adopted.…”

Section: Introductionmentioning

confidence: 78%

“…Changes of up to 200% in the gas hold-up were reported by Pijls et al [ 2 ] , Idogawa et al [3,41 and Tarmy et al [ l ] in two-and three-phase bubble columns operating at up to 15 MPa. On the other hand, gas holdup measurements reported by Vafopoulos et al [ 5 ] , Deckwer et al. [6] and Kolbel et al [7] in bubble columns at up to 2.0 MPa show no effect of the reactor pressure.…”

Section: Introductionmentioning

confidence: 80%

“…In contrast to these three reports, Vafopoulos et a1 . [5], Kolbe1 et al [7] and Deckwer et al [6] found no evidence of pressure influence on gas hold-ups and bubble diameters in two-and three phase bubble columns.…”

Section: Chemical Methods For the Determination Of Interfacial Areasmentioning

confidence: 96%

“…[8,9]andVafopoulosetal. [5]. This appears obvious, since pressure does not exert any significant influence on surface tension, viscosity or density of the liquid.…”

Section: Introductionmentioning

confidence: 94%

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Interfacial areas and gas hold‐ups at elevated pressures in a mechanically agitated gas‐liquid reactor

1988

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Interfacial areas and gas hold-ups were determined at pressures of up to 1.7 MPa in a glass vessel, 88 mm in diameter and of standard geometry. Superficial gas velocities between 0.25 and 2.0 cm/s were used and the stirring speed varied between 4 and 30 rps. The interfacial areas were determined by the chemical method, using the model reaction between CO, and aqueous diethanolamine (DEA). Hold-ups were determined by observation of differences in height. In contrast to literature indications, the gas hold-up was found to be independent of reactor pressure. This is also true for the interfacial area.

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“…This is in contrast to the findings of Vafopoulos et al [5] who, on taking photographs, found no in-…”

Section: Visual and Photographic Observationscontrasting

confidence: 95%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 80%

Section: Chemical Methods For the Determination Of Interfacial Areasmentioning

confidence: 96%

“…[8,9]andVafopoulosetal. [5]. This appears obvious, since pressure does not exert any significant influence on surface tension, viscosity or density of the liquid.…”

Section: Introductionmentioning

confidence: 94%

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Interfacial areas and gas hold‐ups at elevated pressures in a mechanically agitated gas‐liquid reactor

1988

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Influence of elevated pressure and particle lyophobicity on hydrodynamics and gas–liquid mass transfer in slurry bubble columns

et al. 2009

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This article reports on the influence of elevated pressure and catalyst particle lyophobicity at particle concentrations up to 3 vol % on the hydrodynamics and the gasto-liquid mass transfer in a slurry bubble column. The study was done with demineralized water (aqueous phase) and Isopar-M oil (organic phase) slurries in a 0.15 m internal diameter bubble column operated at pressures ranging from 0.1 to 1.3 MPa. The overall gas hold-up, the flow regime transition point, the average large bubble diameter, and the centerline liquid velocity were measured along with the gas-liquid mass transfer coefficient. The gas hold-up and the flow regime transition point are not influenced by the presence of lyophilic particles. Lyophobic particles shift the regime transition to a higher gas velocity and cause foam formation. Increasing operating pressure significantly increases the gas hold-up and the regime transition velocity, irrespective of the particle lyophobicity. The gas-liquid mass transfer coefficient is proportional to the gas hold-up for all investigated slurries and is not affected by the particle lyophobicity, the particle concentration, and the operating pressure. A correlation is presented to estimate the gas-liquid mass transfer coefficient as a function of the measured gas hold-up: k l a l =e g ¼ 3:0

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Der Einfluß von Tensiden auf den Stoffübergang in begasten Reaktoren

Sztatecsny¹,

Vafopulos

Moser

1977

Chemie Ingenieur Technik

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Wissenschaftliche Forschungsarbeit -Synopse CHEMIE INGENIEUR TECHNIK Der EinfluO von Tensiden auf den Stoffubergang in begasten ReaktorenKlaus ,Sztatecsny, llja Vafopulos und Franz Moser* Der Stoff austausch in begasten Flussigkeiten hangt sowohl von der GroDe der Blasen und ihrer Form, als auch von den hydrodynamischen Bedingungen, dem gegenseitigen Einflufl der einzelnen Blasen aufeinander sowie der Koaleszenz-Zerteilungsfolge ab. Diese Parameter sind miteinander gekoppelt und werden stark von der Grenzflachenspannung des Systems beeinfluflt. Bereits Spuren von oberflachenaktiven Substanzen konnen die Grenzflachenspannung betrachtlich herabsetzen.

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Der Einfluß des Partial‐ und Gesamtdruckes auf den Stoffaustausch

Cited by 8 publications

References 3 publications

Interfacial areas and gas hold‐ups at elevated pressures in a mechanically agitated gas‐liquid reactor

Interfacial areas and gas hold‐ups at elevated pressures in a mechanically agitated gas‐liquid reactor

Influence of elevated pressure and particle lyophobicity on hydrodynamics and gas–liquid mass transfer in slurry bubble columns

Der Einfluß von Tensiden auf den Stoffübergang in begasten Reaktoren

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