Effect of adding glycerol and Tween 80 on gas holdup and bubble size distribution in an aerated stirred tank

Samaras, Konstantinos; Kostoglou, Margaritis; Karapantsios, Thodoris D.; Mavros, Paul

doi:10.1016/j.colsurfa.2013.02.031

Cited by 21 publications

(20 citation statements)

References 34 publications

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“…The achieved foam volume is mainly governed by the foamability of the surfactant and surfactant concentration, but other process parameters should also be taken into consideration. For instance, an increase in rotational speed decreases the bubble size, increases the foam volume, and decreases the density of foam during mechanical stirring (Samaras et al 2014;Wu et al 2012). Surfactants are essential for the foaming process because they decrease the surface tension allowing more foam to be formed.…”

Section: Introductionmentioning

confidence: 99%

Lightweight lignocellulosic foams for thermal insulation

et al. 2022

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Foams are mainly composed of dispersed gas trapped in a liquid or solid phase making them lightweight and thermally insulating materials. Additionally, they are applicable for large surfaces, which makes them attractive for thermal insulation. State-of-the-art thermally insulating foams are made of synthetic polymeric materials such as polystyrene. This work focuses on generating foam from surfactants and renewable lignocellulosic materials for thermally insulating stealth material. The effect of two surfactants (sodium dodecyl sulphate (SDS) and polysorbate (T80)), two cellulosic materials (bleached pulp and nanocellulose), and lignin on the foaming and stability of foam was investigated using experimental design and response surface methodology. The volume-optimized foams determined using experimental design were further studied with optical microscopy and infrared imaging. The results of experimental design, bubble structure of foams, and observations of their thermal conductivity showed that bleached pulp foam made using SDS as surfactant produced the highest foam volume, best stability, and good thermal insulation. Lignin did not improve the foaming or thermal insulation properties of the foam, but it was found to improve the structural stability of foam and brought natural brown color to the foam. Both wet and dry lignocellulosic foams provided thermal insulation comparable to dry polystyrene foam. Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Lightweight lignocellulosic foams for thermal insulation

et al. 2022

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“…It is evident from the published data that the most widely used impellers for these tasks are the flat‐blade disc turbine (FBDT) and the Rushton turbine (RT) 38. Additionally, it is important to highlight that in recent years more research attention has been directed to forward/reverse rotating multi‐impellers on a common shaft 39–41, which are also used in the creation of G‐L‐L systems 42–44. Regardless of which stirrer is applied, the purpose of the stirrer is the same, i.e.…”

Section: Introductionmentioning

confidence: 99%

Aeration of Liquid‐Liquid Systems Using Various Agitators in a Mixer Equipped with a Membrane Diffuser

Szaferski

Mitkowski

2016

Chem Eng & Technol

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Efficient aeration of liquid mixtures is essential in many biochemical and chemical processes. The power requirements needed to obtain three-phase gas-liquid-liquid systems containing air, mineral oil, and water as modeling mixture were analyzed. The influence of using various kinds of agitators consisting of two stirrers on a common shaft and different volume fractions of oil ranging from 0.111 to 0.429 were investigated experimentally. The studies were performed for three configurations of stirrers consisting of Smith disc, Rushton, or flat-blade turbines.

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“…It can be seen that the pair of values (ε, k L a ) are close to those of the cold mock-up. The k L a normally depends on other properties such as viscosity, density, surface tension, etc. − However, these results would suggest that the cold mock-up with a water–nitrogen/air system is able to determine the correct order of magnitude of the parameters that characterize hydrodynamics and mass transfer.…”

Section: Resultsmentioning

confidence: 99%

Simulation of Petroleum Residue Hydroconversion in a Continuous Pilot Unit Using Batch Reactor Experiments and a Cold Mock-Up

Jansen

Guerry

Leclerc

et al. 2014

Ind. Eng. Chem. Res.

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SSCI-VIDE+ECI2D+TJA:DGU:ELE:MLA:CGE:MTFInternational audienceThe kinetics of atmospheric petroleum residue hydroconversion with a dispersed catalyst was studied. A methodology has been developed in order to transpose the chemical kinetics (reaction network, stoichiometry, and kinetic constants) obtained with a batch reactor by Nguyen et al. to a continuous reactor [Nguyen, T. S.; Tayakout-Fayolle, M.; Ropars, M.; Geantet, C. Chem. Eng. Sci. 2013, 94, 214]. Their five-lump kinetic model takes into account vaporliquid mass transfer, vaporliquid equilibriums, and hydrogen consumption. Consequently, hydrodynamics and vaporliquid mass transfer of the micropilot unit's reactor were studied in a cold mock-up by tracer experiments. The same thermodynamic model given by Nguyen et al. was used, and the flash calculations were performed using ProSimPlus software. Experimental data were obtained in the micropilot unit at 420, 430, and 440 degrees C with a dispersed catalyst for residence times of 1 and 2 h. The catalyst precursor, an oil-soluble molybdenum naphthenate, was added to obtain a molybdenum concentration of 600 wt ppm in the feedstock. The total pressure was 12 MPa with a hydrogen-to-feed ratio of 500 N m(3)/m(3). The methodology was validated by comparing the model's output with the experimental results

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Effect of adding glycerol and Tween 80 on gas holdup and bubble size distribution in an aerated stirred tank

Cited by 21 publications

References 34 publications

Lightweight lignocellulosic foams for thermal insulation

Lightweight lignocellulosic foams for thermal insulation

Aeration of Liquid‐Liquid Systems Using Various Agitators in a Mixer Equipped with a Membrane Diffuser

Simulation of Petroleum Residue Hydroconversion in a Continuous Pilot Unit Using Batch Reactor Experiments and a Cold Mock-Up

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