Gas absorption in slurries of finite-capacity microphases

Mehra, Anurag

doi:10.1016/0009-2509(90)80004-x

Cited by 14 publications

(5 citation statements)

References 22 publications

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“…Several authors have proposed an unsteady-state pseudohomogeneous model to describe gas absorption into a liquid in the presence of a second immiscible phase with finite capacity (Holstvoogd et al, 1986;Mehra, 1988Mehra, , 1990. The use of a steady-state pseudo-homogeneous model has been proposed in literature (Janakiraman and Sharma, 1985b).…”

Section: Modelingmentioning

confidence: 99%

Physical absorption of CO₂ and propene into toluene/water emulsions

1994

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Section: Modelingmentioning

confidence: 99%

Physical absorption of CO₂ and propene into toluene/water emulsions

1994

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“…The effect of the solubility (or equivalently, the adsorption capacity) of the dispersed phase for the diffusing solute was investigated by Holstvoogd and van Swaaij [11] and Mehra [12], both using an instationary, penetration theory based, homogeneous model for gasabsorption. It was found that particles with a low capacity (i.e.…”

Section: Introductionmentioning

confidence: 99%

A one-dimensional instationary heterogeneous mass transfer model for gas absorption in multiphase systems

Brilman

Swaaij

Versteeg

1998

Chemical Engineering and Processing: Process Intensification

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For a physically correct analysis (and prediction) of the effect of fine, dispersed phase drops or particles on the mass transfer rate in multiphase systems, it was demonstrated that only 3-D instationary, heterogeneous mass transfer models should be used. Existing models are either homogeneous, stationary or single particle models. As a first step, a 1-D, instationary, heterogeneous multi-particle mass transfer model was developed. With this model the influence of several system parameters was studied and problems and pitfalls in the translation of modeling results for heterogeneous models into a prediction of absorption fluxes are discussed. It was found that only those particles located closely to the gas-liquid interface determine mass transfer. For these particles the distance of the first particle to the gas-liquid interface and the particle capacity turned out to be the most important parameters. Comparisons with a homogeneous model and experimental results are presented. Typical differences in results comparing a homogeneous model with the 1-D heterogeneous model developed in this work could be attributed to a change in the near interface geometry. Future work in this field should therefore be directed towards near interface phenomena. Three dimensional mass transfer models, of which a preliminary result is presented, are indispensable for this.

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“…The reason behind it is that for nearly all systems which have positive spreading coefficient initially, at equilibrium, both the continuous phase and the dispersed phase get mutually saturated, thus the spreading coefficient is turned out to be negative. The analysis proposed by Wang, 1987 and1990 supported the conclusion that the aqueous phase is continuous at the gas liquid interface. Wang, 1987, and, focused their attention on the permeability effect which could also play an important role in mass transfer enhancement.…”

Section: Bubble Covering Mechanismmentioning

confidence: 65%

“…It was realized that a steady state model is not able to (Holstvoogd et al, 1986;Mehra 1988Mehra , 1990 and Nagy and Moser, 199S). It was realized that a steady state model is not able to (Holstvoogd et al, 1986;Mehra 1988Mehra , 1990 and Nagy and Moser, 199S).…”

Section: Homogeneous Modelsmentioning

confidence: 99%

Role of Dispersed Phase in Gas-Liquid Reactions: A Review

Kaur¹,

Ramakrishna²,

Nigam³

2007

Reviews in Chemical Engineering

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Gas-liquid-liquid reactions have an important place in the engineering and chemical fields. A review on gas-liquid-liquid reactions is presented, considering the effect of addition of an immiscible (mainly organic) liquid on gas-liquid system. The effect of the presence of immiscible liquid on kt» and a has been reviewed. The dispersed phase has a significant role in mass transfer enhancement. The volumetric mass transfer coefficient, k L a, though initially decreases, it increases with higher loading of the dispersed phase. This behavior has been explained taking into account the nature of dispersed phase and the spreading coefficient, S. The spreading coefficient, bubble and droplet size and turbulence induced by the presence of dispersed phase are •the important parameters in the enhancement of the mass transfer. The enhancement in the mass transfer can be explained by four types of mechanisms, namely: (1) Shuttle effect or grazing mechanism; (2) Bubble covering mechanism; (3) The permeability effect and (4) The hydrodynamic effect. Further, for describing the phenomenon of gas absorption in the presence of dispersed phase, two different types of models, namely homogeneous and heterogeneous models, were reported in the literature. + IICT Communication No.: 070204 247 Brought to you by |

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Gas absorption in slurries of finite-capacity microphases

Cited by 14 publications

References 22 publications

Physical absorption of CO₂ and propene into toluene/water emulsions

Physical absorption of CO₂ and propene into toluene/water emulsions

A one-dimensional instationary heterogeneous mass transfer model for gas absorption in multiphase systems

Role of Dispersed Phase in Gas-Liquid Reactions: A Review

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Gas absorption in slurries of finite-capacity microphases

Cited by 14 publications

References 22 publications

Physical absorption of CO2 and propene into toluene/water emulsions

Physical absorption of CO2 and propene into toluene/water emulsions

A one-dimensional instationary heterogeneous mass transfer model for gas absorption in multiphase systems

Role of Dispersed Phase in Gas-Liquid Reactions: A Review

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Product

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Physical absorption of CO₂ and propene into toluene/water emulsions

Physical absorption of CO₂ and propene into toluene/water emulsions