Heterogeneous mass transfer models for gas absorption in multiphase systems

Brilman, Wim; Goldschmidt, Mjv; Versteeg, Geert; Swaaij, W.P.M. van

doi:10.1016/s0009-2509(99)00491-1

Cited by 50 publications

(56 citation statements)

References 29 publications

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“…They tested the model using oxygen absorption in aqueous solutions using n-hexadecane as a dispersed phase. Brilman, Goldschmidt, Versteeg and van Swaaij (2000) recently developed 3-D heterogeneous mass transfer models to study this grazing e!ect in more detail. From their overview of all models describing these e!ects, it can be concluded that, although these heterogeneous models are to be preferred from a physical point of view, the homogeneous models describe the experimental data equally well for simple cases and require less detailed input parameters.…”

Section: Previous Workmentioning

confidence: 99%

Gas absorption in an agitated gas–liquid–liquid system

Cents

Brilman

Versteeg

2001

Chemical Engineering Science

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Gas}liquid}liquid systems have gained interest in the past decade and are encountered in several important industrial applications. In these systems an immiscible liquid phase may a!ect the gas absorption rate signi"cantly. This phenomenon, however, is not completely understood and underlying mechanisms need further study. In this work the well-known Danckwerts-plot technique is used to determine the liquid side mass transfer coe$cient k * and the gas}liquid interfacial area a simultaneously in this type of systems. As absorption/reaction system CO absorption in a 0.5 M K CO /0.5 M KHCO bu!er solution catalysed by sodium hypochlorite was chosen. Toluene, n-dodecane, n-heptane and 1-octanol were applied as dispersed liquid phases. The Danckwertsplot could be well used in gas}liquid}liquid systems and from the results it appeared that two types of systems exist; systems that enhance mass transfer and systems that do not enhance mass transfer. E!ects at low dispersed phase hold-up were observed to be very strong and are thus important, but were not taken into account in further analysis of the e!ect of dispersed phase hold-up on mass transfer. In systems where dodecane and heptane were added to the bu!er solutions no enhancement of mass transfer was observed. However, the addition of toluene and 1-octanol caused an enhancement of mass transfer that could be well described using a homogeneous model of the shuttle mechanism.

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Section: Previous Workmentioning

confidence: 99%

Gas absorption in an agitated gas–liquid–liquid system

Cents

Brilman

Versteeg

2001

Chemical Engineering Science

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“…Finally, it should be noted that the role of the lateral di®usion into the particles in the boundary layer can also be of importance, especially, in the case of the high solubility coe±cient, H . This was demonstrated by Lin and Zhou [9] and later by Brilman et al [3] using two-and three-dimensional models, respectively. The lateral di®usion can act, however, when there is enough liquid volume surrounding a particle in the absence of other particles.…”

Section: Introductionmentioning

confidence: 75%

On the three-phase mass transfer with solid particles adhered to the gas-liquid interface

Nagy

2003

Open Chemistry

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A heterogeneous, multi-layer mass transfer model is proposed for prediction of the e¬ect of multi-layer packing of catalyst particles adhered to the gas-liquid interface. The behavior of the mass transfer rate with respect to the multi-layer packing, to the particle size and mass transfer coe¯cient without particles is discussed. It is shown that enhancement can be considerably increased by multi-layer packing compared to that of mono-layer packing, depending on the values of particle size and mass transfer coe¯cient. The predicted mass transfer rates using the proposed model was veri ed with experimental data taken from the literature. The model presented should be superior to that of published in the literature.

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“…It is well established that the gas-liquid mass transfer rate is significantly enhanced when the solubility of the gas is substantially higher in the dispersed phase and when the dispersed droplets are small compared to the (film theory) mass transfer boundary layer thickness d c [38]. Such enhancement of the adsorption rate has been explained in terms of the so-called "microphase catalysis"-, "grazing"-or "shuttle"-mechanism [17,39].…”

Section: Mass Transfer Modellingmentioning

confidence: 99%

“…Brilman et al [37,38] and Beenackers and van Swaaij [39] reviewed the plethora of mass transfer models proposed for such gas-liquid-liquid systems. The model chosen in this study is of the homogeneous type.…”

Section: Mass Transfer Modellingmentioning

confidence: 99%

“…The model chosen in this study is of the homogeneous type. Despite the fact that such models are based on physically unrealistic assumptions, they do predict the correct trends with respect to changing operating conditions such as the gas-liquid contact time, the relative solubility and the dispersed phase volume fraction [38]. An added advantage is the mathematical simplicity that permits analytical solution of the differential equations.…”

Section: Mass Transfer Modellingmentioning

confidence: 99%

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Optimization of perfluorocarbon emulsion properties for enhancing oxygen mass transfer in a bio-artificial liver support system

MOOLMAN¹

2004

Biochemical Engineering Journal

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The oxygen carrying performance of a perfluorooctyl bromide (PFOB) emulsion is considered. The intended purpose is to enhance hepatocyte growth and function in a bio-artificial liver support system (BALSS). Such oxygen carrying emulsions have previously been used in biological systems (e.g. cell culturing). However, optimum emulsion characteristics for enhanced oxygen mass transfer have not been established nor was consideration given to the effect of emulsion rheology on mass transfer: With increase in the dispersed phase volume fraction (φ p ) both the oxygen holding capacity and the viscosity increases. These issues are addressed here using simplified mass transfer models, amenable to analytical solution, for both gas-sparged and membrane oxygenators. The model predictions that the rate at which oxygen can be supplied improves with increase in φ p and decrease in emulsion droplet size were checked experimentally for perfluorooctyl bromide emulsions. Biological applications mandate a suitably low emulsion viscosity and this limits the usable range for the PFOB volume fraction to φ p < 0.5. There is also a lower practical limit to the possible droplet size (about 100 nm).The predicted higher oxygen loading rates for the membrane oxygenator compared to the gas-sparged oxygenator was also confirmed by experiment. Predicted and measured volumetric mass transfer coefficients (k × a) were ca. 8 × 10 −4 s −1 for the gas-sparged oxygenator and ca. 1 s −1 for the hollow fibre membrane unit at 20 vol.% PFOB emulsions.

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Heterogeneous mass transfer models for gas absorption in multiphase systems

Cited by 50 publications

References 29 publications

Gas absorption in an agitated gas–liquid–liquid system

Gas absorption in an agitated gas–liquid–liquid system

On the three-phase mass transfer with solid particles adhered to the gas-liquid interface

Optimization of perfluorocarbon emulsion properties for enhancing oxygen mass transfer in a bio-artificial liver support system

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