Interfacial area and mass transfer in carbon dioxide absorption in TEA aqueous solutions in a bubble column reactor

Rubia, M. Dolores La; García-Abuín, Alicia; Gómez‐Díaz, Diego; Navaza, José M.

doi:10.1016/j.cep.2010.06.003

Cited by 41 publications

(25 citation statements)

References 28 publications

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“…For example, for viscosities beyond µ L > 30 mPa·s, the contribution of the small bubbles results in a further increase in the total ε G with increasing viscosity [59], instead of the levelling at a constant value, as reported by Eissa and Schugerl [150]. An exception to the above references is the study of La Rubia et al [241], who observed a decrease of d eq from 4.6 to 4.2 mm while increasing U G . Besagni et al reported a "dual effect of viscosity on BSDs"; the BSDs shifted towards low equivalent diameters for "low/moderate" viscosities and, for higher viscosities, cap-bubbles appeared in addition to the spherical-ellipsoidal bubbles.…”

Section: Influence Of the Liquid Properties Viscous Mediamentioning

confidence: 49%

“…It is generally admitted that-in the homogeneous flow regime-d b increases [156] and, after the transition, "coalescence induced" bubbles appear, whereas the contribution of the "non-coalescence induced" bubbles remain constant [18]. Some authors reported an increase in d b with superficial gas velocity, both in the homogeneous and heterogeneous flow regimes [35,38,85,87,127,183,[232][233][234][235][236][237][238][239], while other authors reported no effect of U G over d b [188,240] and some others reported a decrease in the bubble size [241]. In the literature, both unimodal [239] and bimodal [242][243][244][245] BSD have been found depending on the gas sparger design and operating conditions.…”

Section: Superficial Gas Velocitymentioning

confidence: 91%

“…When using active compounds, the bubble size distribution changes because of coalescence suppression, and a decrease in d b is expected (along with an increase in ε G ) [8,38,56,80,108,127,149,161,234,241,253,270,271]. Among the broader literature on the topic, we present some examples for the sake of clearness.…”

Section: Active Compoundsmentioning

confidence: 99%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: Influence Of the Liquid Properties Viscous Mediamentioning

confidence: 49%

Section: Superficial Gas Velocitymentioning

confidence: 91%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…For example, for viscosities G. Besagni et al Chemical Engineering Science 158 (2017) 509-538 beyond μ L > 30 mPa-s, the contribution of the small bubbles results in a further increase of the total gas holdup with increasing viscosity (Kuncová and Zahradník, 1995), instead of the levelling at a constant value, as reported by Eissa and Schügerl (1975). An exception with the above references is the study of La Rubia et al (2010), who observed a decrease of d eq from 4.6 to 4.2 mm while increasing U G . At present, it is not clear whether a "dual effect of viscosity over BSD" exists.…”

Section: Influence Of Viscosity On the Bubble Size Distributions And mentioning

confidence: 73%

The dual effect of viscosity on bubble column hydrodynamics

Besagni

Inzoli

Guido

et al. 2017

Chemical Engineering Science

110

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A B S T R A C TSome authors, in the last decades, have observed the dual effect of viscosity on gas holdup and flow regime transition in small-diameter and small-scale bubble columns. This work concerns the experimental investigation of the dual effect of viscosity on gas holdup and flow regime transition as well as bubble size distributions in a large-diameter and large-scale bubble column. The bubble column is 5.3 m in height, has an inner diameter of 0.24 m, and can be operated with gas superficial velocities in the range of 0.004-0.20 m/s. Air was used as the dispersed phase, and various water-monoethylene glycol solutions were employed as the liquid phase. The water-monoethylene glycol solutions that were tested correspond to a viscosity between 0.9 mPa s and 7.97 mPa s, a density between 997.086 kg/m 3 and 1094.801 kg/m 3 , a surface tension between 0.0715 N/m and 0.0502 N/m, and log 10 (Mo) between −10.77 and −6.55 (where Mo is the Morton number). Gas holdup measurements were used to investigate the global fluid dynamics and the flow regime transition between the homogeneous flow regime and the transition flow regime. An image analysis method was used to investigate the bubble size distributions and shapes for different gas superficial velocities, for different solutions of watermonoethylene glycol. In addition, based on the experimental data from the image analysis, a correlation between the bubble equivalent diameter and the bubble aspect ratio was proposed. The dual effect of viscosity, previously verified in smaller bubble columns, was confirmed not only with respect to the gas holdup and flow regime transition, but also for the bubble size distributions. Low viscosities stabilize the homogeneous flow regime and increase the gas holdup, and are characterized by a larger number of small bubbles. Conversely, higher viscosities destabilize the homogeneous flow regime and decrease the gas holdup, and the bubble size distribution moves toward large bubbles. The experimental results suggest that the stabilization/destabilization of the homogeneous regime is related to the changes in the bubble size distributions and a simple approach, based on the lift force, was proposed to explain this relationship. Finally, the experimental results were compared to the dual effect of organic compounds and inorganic compounds: future studies should propose a comprehensive theory to explain all the dual effects observed.

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“…More recent work has used photography [23]- [25][44]- [47], nonisokinetic withdrawal in conjunction with electro-optic detection [48], two needle local probes [49], four fibre optic probes [50] and a Wire Mesh Sensor [21]. The liquids used were almost exclusively water with different chemical dissolved in them, e.g., Na2CO3, NaHCO3, NaOH [43], DEA [44], TEA [45], polymer plus surfactant [46] and surfactant [47]. However, the data on the effect of liquid viscosity are limited.…”

Section: Figmentioning

confidence: 99%

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

Azzopardi

Agunlejika

Zhao

et al. 2017

Chemical Engineering Journal

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Ionic liquids are liquid salts at low temperatures (normally less than 100°C). They are powerful solvents with very low vapour pressure. They have great potentials in many applications such as gas absorption and chemical synthesis. However, they are expensive. This limits extensive studies towards establishing phenomenological models. To address this limitation, an analogue liquid, with properties similar to an ionic liquid, has been identified which on the grounds of cost and safety appears to be suitable.In this paper, the hydrodynamic behaviour of an ionic liquid in a bubble column is compared with those of water and other liquids with similar physical properties. Average gas holdup, bubble coalescence, bubble size and specific interfacial area with different liquids are examined. Gas hold-up was determined by monitoring the change of conductivity between two flush mounted rings. The differences in bubble size and coalescence are revealed by analysing the stills taken from a high speed video camera. The dominant flow pattern in a small diameter column with ionic liquids or other fluids having similar viscosity is slug flow. The small bubbles in the liquid slugs make a smaller contribution to the specific interfacial area than Taylor bubbles. It is observed that Taylor bubbles can coalesce. The hydrodynamics of an ionic liquid in a bubble column can be estimated from that of a fluid with similar physical properties.

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Interfacial area and mass transfer in carbon dioxide absorption in TEA aqueous solutions in a bubble column reactor

Cited by 41 publications

References 28 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

The dual effect of viscosity on bubble column hydrodynamics

Characterisation of an analogue liquid for hydrodynamic studies of gas-ionic liquid flows

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