Unified study of flow regimes and gas holdup in the presence of positive and negative surfactants in a non-uniformly aerated bubble column

Cachaza, Elena M.; Díaz, Margarita; Montes, Francisco Javier Alejo; Galán, Miguel Á.

doi:10.1016/j.ces.2011.05.036

Cited by 23 publications

(11 citation statements)

References 49 publications

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“…Because very few liquids have different surface tension but similar viscosity, the research on the effect of surface tension in a bubble column is still limited. In contrast, many studies have looked at the effect of surfactant additive in surfactant solutions . Alcohols are added to water as positive surfactants and the surface tension decreases with increasing alcohol concentration .…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, many studies have looked at the effect of surfactant additive in surfactant solutions . Alcohols are added to water as positive surfactants and the surface tension decreases with increasing alcohol concentration . With the addition of alcohol, the gas holdup increases significantly, but the gas–liquid mass transfer coefficient decreases .…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the bubble size decreased and the bubble gas holdup increased with the addition of electrolyte salt to water because the electrolyte stabilized the bubbles and decreased the bubble coalescence rate . Both positive and negative surfactants inhibit bubble coalescence and the inhibition effect usually increases with surfactant concentration …”

Section: Introductionmentioning

confidence: 99%

“…19,20 Both positive and negative surfactants inhibit bubble coalescence and the inhibition effect usually increases with surfactant concentration. 14 Although surfactant additive has been shown to strongly affect the bubble coalescence and breakup behaviors, most research only studied low ranges of surfactant concentration. Detailed studies of the whole concentration range are very limited, except that Syeda et al 21 and Shah et al 22 measured the total gas holdup over the whole concentration range of alcohol-water mixture.…”

Section: Introductionmentioning

confidence: 99%

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Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Guo

Wang

Yang

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND: Bubble column reactors are widely used in chemical processes and wastewater processing. The relevant properties of surface tension play important roles in the hydrodynamics and bubble coalescence and breakup. However, the underlying mechanisms are complicated and need further research. In this work, the bubble behaviors were studied in a bubble column of 0.1 m i.d. with pure liquids of different surface tension and alcohol solutions varying in concentration and alcohol type.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Guo

Wang

Yang

et al. 2016

J of Chemical Tech & Biotech

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“…It has been proved by many researchers that bubble coalescence probability increases with inorganic ions concentration. When inorganic ions' concentration is above the critical value, bubble coalescence even disappears (Jamialahmadi and Müller-Steinhagen, 1992;Ruzicka et al, 2008;Cachaza et al, 2011). One reason for this phenomenon is that the surface tension of washing solution increases due to the existence of inorganic ions.…”

mentioning

confidence: 99%

Measurement for Surface Tension of Aqueous Inorganic Salt

et al. 2018

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Bubble columns are effective means of filtration in filtered containment venting systems. Here, the surface tension has a significant influence on bubble size distribution and bubble deformation, which have a strong impact on the behavior of the bubble column. The influence of aqueous inorganic compounds on the surface tension depends on the electrolytic activity, Debye length, entropy of ion hydration, and surface deficiencies or excess. In this work, the surface tensions of same specific aqueous solutions have been measured by different methods including platinum plate method, platinum ring method, and maximum bubble pressure method. The measured surface tensions of both sodium hydroxide and sodium thiosulfate are less than that of water. As solution temperature ranges from 20 to 75°C, the surface tension of 0.5 mol/L sodium hydroxide solution decreases from 71 to 55 mN/m while that of 1 mol/L solution decreases from 60 to 45 mN/m. Similarly during the same temperature range, the surface tension of 0.5 mol/L sodium thiosulfate decreases from 70 to 38 mN/m, and that of 1 mol/L sodium thiosulfate is between 68 and 36 mN/m. The analysis for the influence mechanism of aqueous inorganic on surface tension is provided. In addition, experimental results show that the surface tension of solid aerosol suspension liquid has no obvious difference from that of distilled water.

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Impact of Surfactant Chemistry on Bubble Column Systems

et al. 2014

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The impact of surfactant addition on the overall holdup, drag coefficient, and bubble size distribution (BSD) in a bubble column operating at industrially relevant superficial velocities was analyzed. A range of surfactants was examined, including alcohols, sugars, and antifoaming agents. It was ascertained that the effect of a surfactant on the holdup and BSD could be related to the chemical structure of the compound, specifically its hydrophilic/hydrophobic nature as characterized by the octanol/water partition coefficient. Addition of 2‐propanol to an air/water system induces a behavior similar to the fermentation media used in aerobic bioprocesses, meaning that such a system can be applied as a meaningful physical analogue in pilot‐scale experimentation.

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Unified study of flow regimes and gas holdup in the presence of positive and negative surfactants in a non-uniformly aerated bubble column

Cited by 23 publications

References 49 publications

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Measurement for Surface Tension of Aqueous Inorganic Salt

Impact of Surfactant Chemistry on Bubble Column Systems

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